Changes locks (8)

I believe the answer is:

switches

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This clue might be a double definition.

'changes' is the first definition.
(I know this)

'locks' is the second definition.
The definition and answer can be both acts as well as being plural nouns.
Maybe you can see a link between them that I can't see?

Can you help me to learn more?

(Another definition for switches that I've seen is " changes".)

I've seen this clue in The Guardian, The Telegraph and the Sydney Morning Herald.

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