Grind one’s teeth (5)

I believe the answer is:

gnash

'grind one's teeth' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for gnash that I've seen before include "grate" , "Grind away" , "Grind (teeth) together" , "grinding action" , "Grind one's teeth" .)

I've seen this clue in The Mirror, the King Feature Syndicate and the Evening Standard.

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