The most common and most likely answer to this crossword clue is the 2 plus 8 letter word IN STITCHES
I've seen this crossword clue in The Times
I
N
S
T
I
T
C
H
E
S
More clues leading to the result IN STITCHES
- Rolling with laughter, as you may be after theatre trip
- Laughing uncontrollably following theatre visit?
- Following a visit to the theatre one may be laughing uncontrollably
- L
- One’s suffering from scabies, splitting sides
- Laughing uncontrollably this month is irritating
- Laughing uncontrollably at home, son with small children
- Laughing uncontrollably after surgeon has tied up?
- Home schooling to start — little ones very amused
- After visiting the theatre one may be laughing uncontrollably
Buddy explains!

The straight part
We know that "Laughing uncontrollably following theatre visit?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case laughing uncontrollably following theatre visit? = in stitches.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.