Stomach accommodates large excess (4)
I believe the answer is:
glut
'excess' is the definition.
(glut can mean an excess of something)
'stomach accommodates large' is the wordplay.
'stomach' becomes 'gut' (I've seen this before).
'accommodates' is an insertion indicator.
'large' becomes 'L' (eg in clothes sizes).
'gut' going around 'l' is 'GLUT'.
(Other definitions for glut that I've seen before include "Oversupply, plethora" , "An excessive supply or surfeit" , "Superfluity" , "Excess, surfeit" , "An over-supply, harvest surplus" .)