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