Crossword Genius

Intestinal fortitude (4)

Ross

I believe the answer is:

guts

'intestinal fortitude' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for guts that I've seen before include "Fortitude - innards" , "Belly; courage" , "Fortitude and determination" , "Pluck -- intestines" , "Spunk" .)

I've seen this clue in the Evening Standard and the LA Times.
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