Crossword Genius

Courage that may be needed on icy roads (4)

Ross

I believe the answer is:

grit

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for grit that I've seen before include "Coarse sandstone - strength of character" , "Small particles of sand etc" , "Small particles of stone or sand" , "Fine stones or sand" , "Small hard particles - courage" .)

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