Sound weapons, though hardly lethal (7)

I believe the answer is:

popguns

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'hardly lethal' is the definition.
I can't judge whether this defines the answer.

'sound weapons' is the wordplay.
'sound' becomes 'pop' (popping is a kind of sounding).
'weapons' becomes 'guns' (gun is a kind of weapon).
'pop'+'guns'='POPGUNS'

'though' acts as a link.

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I've seen this clue in the Evening Standard.

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