Sit around drunk at four, late out of theatre (13)
I believe the answer is:
postoperative
'sit around drunk at four late out of theatre' is the definition.
I can't judge whether this defines the answer.
'sit around drunk at four' is the wordplay.
'sit' becomes 'pose' (as in sitting for a painter).
'around' is an insertion indicator.
'drunk' becomes 'toper' (toper can mean a drunken person).
'four' becomes 'IV' (Roman numerals for four).
'toper'+'at'+'iv'='toperativ'
'pose' going around 'toperativ' is 'POSTOPERATIVE'.
Can you help me to learn more?
(Other definitions for postoperative that I've seen before include "just beyond the theatre?" , "Relating to period after surgery" .)