Every fruit's topless (4)
I believe the answer is:
each
'every' is the definition.
('each' can be a synonym of 'every')
'fruit's topless' is the wordplay.
'fruit' becomes 'peach' (peach is a kind of fruit).
'topless' means to remove the first letter.
'peach' with its initial letter removed is 'EACH'.
(Other definitions for each that I've seen before include "Every - apiece" , "Ache (anag.)" , "Everyone separately" , "Per person" , "every one individually" .)