Crossword Genius

Clench, like teeth (4)

Ross

I believe the answer is:

grit

(Other definitions for grit that I've seen before include "Indomitability" , "Persevering courage" , "Determination - which is found on winter roads" , "Fragments to sprinkle on roads" , "Jock's enormous" .)

I've seen this clue in the USA Today.
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