Roly-poly pudding for starters topped with fruit (5)
I believe the answer is:
plump
'roly-poly' is the definition.
(I've seen this in another clue)
'pudding for starters topped with fruit' is the wordplay.
'for starters' indicates taking the first letters.
'topped with' says to put letters next to each other.
'fruit' becomes 'plum' (plum is a kind of fruit).
The first letter of 'pudding' is 'p'.
'p' put after 'plum' is 'PLUMP'.
(Other definitions for plump that I've seen before include "Opt - round" , "Tubby; opt (for)" , "Chubby, round" , "Choose; chubby" , "Corpulent" .)