Cherry, nut and bananas not required (9)
I believe the answer is:
redundant
'not required' is the definition.
'cherry nut and bananas' is the wordplay.
'cherry' becomes 'red' (synonyms).
'bananas' is an anagram indicator (informal term for mad).
'nut'+'and'='nutand'
'nutand' is an anagram of 'undant'.
'red'+'undant'='REDUNDANT'
(Other definitions for redundant that I've seen before include "without useful purpose" , "jobless!" , "No longer required, unnecessary" , "on the scrap heap?" , "Superfluous to requirements" .)