Midriff, abdomen (5)
I believe the answer is:
tummy
This clue is a double definition.
'midriff' is the first definition.
(thesaurus)
'abdomen' is the second definition.
(I've seen this before)
(Other definitions for tummy that I've seen before include "Stomach (informal)" , "Stomach (colloq.)" , "Belly" , "Paunch" , "Stomach, abdomen" .)