Any pistol will shatter these locks (9)

I believe the answer is:

ponytails

I'm a little stuck... Click here to teach me more about this clue!

'locks' is the definition.
The answer and definition can be both body parts as well as being plural nouns.
Perhaps there's a link between them I don't understand?

'any pistol will shatter these' is the wordplay.
'any pistol' can be anagrammed to 'PONYTAILS'.
Though, I'm unsure how this is indicated.

Can you help me to learn more?

(Another definition for ponytails that I've seen is " arrangements for Barnet Fair".)

I've seen this clue in The Times.

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