Cheek, impudence (5)
I believe the answer is:
sauce
This clue is a double definition.
'cheek' is the first definition.
(I've seen this in another clue)
'impudence' is the second definition.
(I've seen this before)
(Other definitions for sauce that I've seen before include "Flavoursome relish or dressing" , "Insolence" , "Cranberry or brandy, say" , "Food accompaniment" , "Dressing served with food" .)