Crossword Genius

Over (4)

Ross

(Other definitions for upon that I've seen before include "Immediately after" , "On tope of" , "Au courant" , "Onto" , "mounted" .)

I've seen this clue in the Evening Standard, The Telegraph, The Star Tribune, The New York Times, the Canadiana, The Wall Street Journal, the Penny Press, The Independent, the LA Times, the USA Today and The Guardian.
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