Excessively fat or fleshy (5)
I believe the answer is:
obese
I believe this clue is a double definition.
'excessively fat' is the first definition.
(I've seen this in another clue)
'fleshy' is the second definition.
(thesaurus)
(Other definitions for obese that I've seen before include "Too chubby" , "Pathologically fat" , "Needing to lose weight" , "Enormously portly" , "Stout" .)