Old bangers that could cause death (7)

I believe the answer is:

muskets

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'old bangers' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe there's an association between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for muskets that I've seen is " Muzzle-loading guns".)

I've seen this clue in the Evening Standard.

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