Crossword Genius

Chew like rodents (4)

Ross

I believe the answer is:

gnaw

(Other definitions for gnaw that I've seen before include "Chew persistently at, say a bone" , "Bite persistently, grind" , "Chew steadily at" , "Chew at, work with teeth" , "Wear away with the teeth" .)

I've seen this clue in the Newsday.
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