They admit being swingers (5)

I believe the answer is:

gates

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'they' is the definition.
Both the answer and definition are plural nouns.
Maybe you can see a link between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for gates that I've seen before include "One of the founders of Microsoft" , "Movable barriers in fence or wall" , "philanthropist" , "Moveable barriers" , "Openings" .)

I've seen this clue in The Globe and Mail.

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