Crossword Genius

Argument-settling fact (8)

Ross

I believe the answer is:

clincher

'argument-settling fact' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Sun.
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