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 Universal, The Star Tribune, the Penny Press, The Mirror, The Wall Street Journal, the USA Today, the King Feature Syndicate, the Newsday, The Washington Post and The New York Times.

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