Crossword Genius

Tiny stones in backbone? (4)

Ross

I believe the answer is:

grit

This clue is a double definition.

'tiny stones' is the first definition.

'backbone?' is the second definition.
(synonyms)

'in' acts as a link.

(Other definitions for grit that I've seen before include "Determination - small stones" , "Determination - which is found on winter roads" , "Gravel or colloquial courage" , "Small hard particles - determination" , "Small loose particles of stone" .)

I've seen this clue in The Telegraph.
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