Crossword Genius

True, it's a John Wayne film (4)

Ross

I believe the answer is:

grit

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But I can't explain it at all! Could you help me understand?

(Other definitions for grit that I've seen before include "Courage - clench - small particle of stone" , "Coarse sandstone - strength of character" , "Guts and gumption" , "Determination - which is found on winter roads" , "Gravel or colloquial courage" .)

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