Crossword Genius

Nibble persistently (4)

Ross

I believe the answer is:

gnaw

'nibble persistently' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for gnaw that I've seen before include "Chew persistently at, say a bone" , "What rodents typically do" , "Nibble like a rodent" , "Eat at" , "Chew at, work with teeth" .)

I've seen this clue in The Telegraph and The Sun.
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