Crossword Genius

Bite at persistently (4)

Ross

I believe the answer is:

gnaw

(Other definitions for gnaw that I've seen before include "Chew and grind down" , "Chew away at" , "Nibble like a rodent" , "Bite persistently, grind" , "Chew or crunch at" .)

I've seen this clue in The Times.
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