Daughter polished off fruit (4)
I believe the answer is:
date
'fruit' is the definition.
(date is a kind of fruit)
'daughter polished off' is the wordplay.
'daughter' becomes 'd'.
'polished off' becomes 'ate' (I've seen this in other clues).
'd'+'ate'='DATE'
(Other definitions for date that I've seen before include "to take out" , "sell-by, for example" , "Go out with" , "Rendezvous" , "Stoned fruit" .)