Initially indicating bananas to a trim ape? (8)
I believe the answer is:
imitator
'ape?' is the definition.
(I know that ape can be written as imitator)
'initially indicating bananas to a trim' is the wordplay.
'initially' indicates taking the first letters.
'bananas' is an anagram indicator (informal term for mad).
The first letter of 'indicating' is 'i'.
'to'+'a'+'trim'='toatrim'
'toatrim' anagrammed gives 'mitator'.
'i'+'mitator'='IMITATOR'
(Other definitions for imitator that I've seen before include "One who copies another" , "Copier (of another)" , "A trio, Tim, is a mimic" , "Someone copying the behaviour of another" , "Ape" .)