In the know (5)

I think it could be either:

aware

hipto

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

This is all the clue.

(Other definitions for aware that I've seen before include "Acquainted with or conscious of" , "Acquainted with or mindful of" , "Having knowledge or realisation" , "Cognizant" , "Attentive" .)

I've seen this clue in the King Feature Syndicate, The Mirror, The Wall Street Journal, The Star Tribune, the Universal, The New York Times, The Washington Post, the Penny Press, the LA Times, the Newsday and the USA Today.

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