Crossword Genius

Good riders in trouble show courage, initially (4)

Ross

I believe the answer is:

grit

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'good' is the definition.
(I know that grit is a type of fortitude)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for grit that I've seen before include "called for on icy roads" , "Courage, small stones" , "Gravel or colloquial courage" , "Pluck; sand particles" , "Coarse stone or sand" .)

I've seen this clue in The Irish Independent.
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