Fruit; soft and well-rounded (5)
I believe the answer is:
plump
'well-rounded' is the definition.
(I've seen this in another clue)
'fruit soft' is the wordplay.
'fruit' becomes 'plum' (plum is a kind of fruit).
'soft' becomes 'p' (musical abbreviation for 'piano').
'plum'+'p'='PLUMP'
'and' acts as a link.
(Other definitions for plump that I've seen before include "Having a full rounded shape" , "Well rounded - opt suddenly" , "Full of figure" , "Buxom, chubby" , "Pleasantly chubby" .)