Crossword Genius

Toughness (4)

Ross

I think it could be either:

grit

guts

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

This is the entire clue.

(Other definitions for grit that I've seen before include "Guts and gumption" , "Determination - small stones" , "Fortitude" , "Particles of stone/sand" , "Small hard particles - determination" .)

I've seen this clue in The Telegraph.
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