Crossword Genius

Well informed about (4)

Ross

I believe the answer is:

upon

(Other definitions for upon that I've seen before include "Onto" , "Abreast of, au fait with" , "Thereafter" , "Carried - on top" , "Preposition" .)

I've seen this clue in the Newsday.com, The Telegraph, The New York Times and the Wall Street Journal.
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