Fruit ain’t green, surprisingly (9)
I believe the answer is:
tangerine
'fruit' is the definition.
(tangerine is a kind of fruit)
'ain't green surprisingly' is the wordplay.
'surprisingly' indicates an anagram.
'aint'+'green'='aintgreen'
'aintgreen' is an anagram of 'TANGERINE'.
(Other definitions for tangerine that I've seen before include "Orange-type fruit" , "fruit product" , "shade" , "Tree" , "something juicy being given to press" .)