They prevent any escape from bottle-necks (5)

I believe the answer is:

corks

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'they' is the definition.
Both the definition and answer are plural nouns.
Maybe they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for corks that I've seen before include "Bungs" , "Bottle stoppers" .)

I've seen this clue in The Irish Independent.

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