Courage that's needed on icy roads (4)
I believe the answer is:
grit
'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" .)