The most common and most likely answer to this crossword clue is the 4 letter word POST
I've seen this crossword clue in The Times
P
O
S
T
More clues leading to the result POST
- Frank not needed here relieved of job
- Job found in the mail room?
- After sectarian conflict, dispatch part of army deployment
- Letters provided by job agency?
- Immediately make online comments over animosity surrounding society
- Stick up letters in position
- Stop circulating mail
- Send on deployment of troops, say, following Thirty Years War?
- After a job
- Various old poets gathering in private ground after theatre visit?
Buddy explains!

The straight part
We know that "after theatre visit?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case after theatre visit? = post.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does POST mean?
POST noun- A long dowel or plank protruding from the ground; a fencepost; a lightpost.
- A stud; a two-by-four.
- A pole in a battery.
- A long, narrow piece inserted into a root canal to provide retention for a crown.
- (chiefly a cappella) A prolonged final melody note, among moving harmony notes.
- A printing paper size measuring 19.25 inches x 15.5 inches.
- A goalpost.
- A location on a basketball court near the basket.
- The doorpost of a victualler's shop or inn, on which were chalked the scores of customers; hence, a score; a debt.
- To hang (a notice) in a conspicuous manner for general review.
- To hold up to public blame or reproach; to advertise opprobriously; to denounce by public proclamation.
- To carry (an account) from the journal to the ledger.
- To inform; to give the news to; to make acquainted with the details of a subject; often with up.
- To pay (a blind).
- To put content online, usually through a publicly accessible mean, such as a video channel, gallery, message board, blog etc.
- Each of a series of men stationed at specific places along a postroad, with responsibility for relaying letters and dispatches of the monarch (and later others) along the route.
- A station, or one of a series of stations, established for the refreshment and accommodation of travellers on some recognized route.
- A military base; the place at which a soldier or a body of troops is stationed; also, the troops at such a station.
- Someone who travels express along a set route carrying letters and dispatches; a courier.
- An organisation for delivering letters, parcels etc., or the service provided by such an organisation.
- A single delivery of letters; the letters or deliveries that make up a single batch delivered to one person or one address.
- A message posted in an electronic or Internet forum, or on a blog, etc.
- A moderate to deep passing route in which a receiver runs 10-20 yards from the line of scrimmage straight down the field, then cuts toward the middle of the field (towards the facing goalposts) at a 45-degree angle.
- Haste or speed, like that of a messenger or mail carrier.
- One who has charge of a station, especially a postal station.
- To travel with relays of horses; to travel by post horses, originally as a courier.
- To travel quickly; to hurry.
- To send (an item of mail etc.) through the postal service.
- (horse-riding) To rise and sink in the saddle, in accordance with the motion of the horse, especially in trotting.
- To publish (a message) to a newsgroup, forum, blog, etc.
- With the post, on post-horses; by a relay of horses (changing at every staging-post); hence, express, with speed, quickly.
- Sent via the postal service.
- An assigned station; a guard post.
- An appointed position in an organization, job.
- To enter (a name) on a list, as for service, promotion, etc.
- To assign to a station; to set; to place.
- After; especially after a significant event that has long-term ramifications.
- Post-production.
- A post mortem (investigation of body's cause of death).