Wild cats in comical capers (6)
I believe the answer is:
antics
'comical capers' is the definition.
(I've seen this before)
'wild cats in' is the wordplay.
'wild' indicates anagramming the letters.
'cats'+'in'='catsin'
'catsin' is an anagram of 'ANTICS'.
(Other definitions for antics that I've seen before include "Amusing behaviour" , "Goings-on, absurd behaviour" , "Absurd or foolish movements intended to amuse" , "extraordinary goings-on" , "Absurd tricks or pranks" .)