Crossword Genius

Decisive factor (8)

Ross

I believe the answer is:

clincher

'decisive factor' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for clincher that I've seen before include "Something decisive" , "Decisive factor" , "Something settling a matter conclusively" , "Argument-settling fact" , "Decisive argument" .)

I've seen this clue in The Guardian.
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