Belly with time for soup (6)
I believe the answer is:
potage
'for soup' is the definition.
(potage is a kind of soup)
'belly with time' is the wordplay.
'belly' becomes 'pot' (as in a pot belly).
'with' says to put letters next to each other.
'time' becomes 'age' (an age is a period of time).
'pot'+'age'='POTAGE'
(Other definitions for potage that I've seen before include "French soup, usually thick" , "> sort of liquid nourishment" , "this spoon-fed?" , "Thick, often creamy soup" , "Stock food item" .)