A party to (2,2)

I think it could be either:

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2,2

in on

'a party to' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for in on that I've seen before include "Aware of - being part of" , "Participating in - knowing about" , "Wise to" , "Aware of secret" , "Privy to" .)

I've seen this clue in the Universal, the Sydney Morning Herald, The Wall Street Journal and the King Feature Syndicate.

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