In on (4,2)

I think it could be either:

Which length description are you looking for?:

4,2

5,2

privy to

'in on' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Another definition for privy to that I've seen is " Sharing in other's plans or secrets".)

I've seen this clue in the Newsday and The Washington Post.

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