Potato chip, to a Brit (5)
I believe the answer is:
crisp
'potato chip to a brit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for crisp that I've seen before include "Hard, brittle; a snack" , "Firm - sharp - brittle" , "food in packet" , "No-nonsense" , "Thin slice of fried potato" .)