Denouement in knockabout comedy (7)
I believe the answer is:
outcome
'denouement' is the definition.
(thesaurus)
'in knockabout comedy' is the wordplay.
'in' says the answer is hidden in the clue.
'OUTCOME' can be found hidden inside 'knockabout comedy'.
(Other definitions for outcome that I've seen before include "Consequence, upshot" , "Denouement" , "'Result, upshot (7)'" , "answer" , "Eventuality" .)