Plump, rotund (4-4)
I believe the answer is:
roly-poly
I believe this clue is a double definition.
'plump' is the first definition.
(I've seen this before)
'rotund' is the second definition.
(thesaurus)
(Other definitions for roly-poly that I've seen before include "Podgy person -- pudding" , "Substantial" , "Plump - rotund - pudding" , "Plump and round" , "Plump in appearance- steamed pudding" .)