Crossword Genius

Sound criterion for a weapon (6)

Ross

I believe the answer is:

cannon

'for a weapon' is the definition.
(cannon is a kind of weapon)

'sound criterion' is the wordplay.
'sound' indicates a 'sounds like' (homophone) clue.
'criterion' becomes 'canon' (I have seen 'accepted criterion' mean 'canon' so perhaps 'criterion' could also mean 'canon').
'canon' is a homophone of 'CANNON'.

(Other definitions for cannon that I've seen before include "mortar" , "Billiard shot or large gun" , "Snooker shot" , "Item of heavy artillery" , "Large gun that fires heavy shells" .)

I've seen this clue in The Globe and Mail.
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