Crossword Genius

Incontrovertible evidence (5)

Ross

I believe the answer is:

proof

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

This is all the clue.

(Other definitions for proof that I've seen before include "Conclusive demonstration" , "Conclusive evidence or verification" , "Positive evidence" , "Render impervious (to)" , "whisky's strength?" .)

I've seen this clue in The Times and The Irish Times.
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