Crossword Genius

Courage needed on icy roads (4)

Ross

I believe the answer is:

grit

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'courage' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for grit that I've seen before include "Hard particles for firmness of character" , "Gumption or small pieces of stone" , "called for on icy roads" , "Determination - small stones" , "Pluck; sand particles" .)

I've seen this clue in the Evening Standard and The Globe and Mail.
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