Work on correspondence after the theatre (4-2)
I believe the answer is:
post-op
'after the theatre' is the definition.
(after the operating theatre)
'work on correspondence' is the wordplay.
'work' becomes 'op' (common abbreviation for 'opus').
'on' means one lot of letters go next to another.
'correspondence' becomes 'post' (I've seen this in other clues).
'op' put after 'post' is 'POST-OP'.
I've seen this clue in The Guardian.
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