Donald —, Best Actor in a Supporting Role Oscar winner for How Green Was My Valley (5)

I believe the answer is:

crisp

(Other definitions for crisp that I've seen before include "Salted 'n' vinegared item?" , "Thin slice of fried potato" , "Snappy" , "Snack item" , "Hard, brittle; a snack" .)

I've seen this clue in The Mirror.

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