Waste food (7)
I believe the answer is:
fritter
I believe this clue is a double definition.
'waste' is the first definition.
(I know that fritter is a kind of the waste)
'food' is the second definition.
(a fried food)
(Other definitions for fritter that I've seen before include "Deep fried item" , "Battered food - waste" , "Something battered and fried" , "Hot food" , "Waste time or money on frivolities" .)