Plays matchmaker for (4,2)

I think it could be either:

Which length description are you looking for?:

4,2

sets up

'plays matchmaker for' is the definition.
(I've seen this in another clue)

This is all the clue.

(Another definition for sets up that I've seen is " Begins".)

I've seen this clue in the New York Times and the LA Times.

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