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

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