The snack might result in bad chin wads (8)
I believe the answer is:
sandwich
'the snack might result in bad chin wads' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sandwich that I've seen before include "Make it with bread and a filling" , "Food between slices" , "The snack might result in bad chin wads" , "Golf club" , "The snack makes strange chin wads" .)