Finish off nuts and fruit (6)
I believe the answer is:
banana
'fruit' is the definition.
(banana is a kind of fruit)
'finish off nuts' is the wordplay.
'finish off' means to remove the last letter.
'nuts' becomes 'bananas' (as in crazy).
'bananas' with its final letter removed is 'BANANA'.
'and' acts as a link.
(Other definitions for banana that I've seen before include "6 Yellow fruit" , "Fruit with soft, sweet flesh" , "Small politically unstable country dominated by foreign companies" , "Curved yellow fruit" , "Another of 5 down" .)