The most common and most likely answer to this crossword clue is the 14 letter word POST-OPERATIVE
I've seen this crossword clue in The Times
P
O
S
T
-
O
P
E
R
A
T
I
V
E
Buddy explains!
The straight part
We know that "After theatre job" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case after theatre job = post-operative.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-OPERATIVE mean?
POST-OPERATIVE adjective- Of, relating to, or occurring in the period after a surgical operation.