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