Crossword Genius

Toughness (4)

Ross

I think it could be either:

grit

guts

'toughness' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for guts that I've seen before include "Intestines - courage" , "backbone" , "Spunk" , "Stomach" , "Eat greedily" .)

I've seen this clue in The Telegraph.
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