Firm belly (11)
I believe the answer is:
corporation
I believe this clue is a double definition.
'firm' is the first definition.
(I know that corporation is a type of firm)
'belly' is the second definition.
(I know that corporation is a type of belly)
(Other definitions for corporation that I've seen before include "tummy" , "belly" , "beer gut" , "target of 17, 8 [CHANCELLORS STATEMENT[" , "City body; paunch" .)