Crossword Genius

Courage that's 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 how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for grit that I've seen before include "Toughness" , "Persevering courage" , "lamb" , "Coarse stone or sand" , "Gravelly courage" .)

I've seen this clue in The Sun.
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