Crossword Genius

Damning piece of evidence (7,3)

Ross

I believe the answer is:

smoking gun

(Other definitions for smoking gun that I've seen before include "Immediate and irrefutable evidence of crime" , "Clear evidence" , "Unarguable evidence" , "Piece of incriminating evidence" , "Evidence of crime just committed" .)

I've seen this clue in The Guardian.
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