Swingers perhaps broadcast Ben Stiller's lover initially swapping with Tack (10)

I believe the answer is:

libertines

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'swingers perhaps' is the definition.
(swinger is a kind of libertine)

I cannot understand how the remainder of the clue works.

(Another definition for libertines that I've seen is " Dissolute types".)

I've seen this clue in The Independent.

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