Roly-poly using fruit puree primarily (5)
I believe the answer is:
plump
'roly-poly' is the definition.
(I've seen this in another clue)
'fruit puree primarily' is the wordplay.
'fruit' becomes 'plum' (plum is a kind of fruit).
'primarily' indicates taking the first letters.
The initial letter of 'puree' is 'p'.
'plum'+'p'='PLUMP'
'using' is the link.
(Other definitions for plump that I've seen before include "Fat - set down unceremoniously" , "Chubby, round" , "Slightly fat" , "Corpulent" , "Chubby, rounded" .)