Crunchy (5)
I believe the answer is:
crisp
'crunchy' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for crisp that I've seen before include "Firm - sharp - brittle" , "Hard, brittle; a snack" , "Thin slice of fried potato" , "Frosty" , "Fresh and bracing" .)