Crossword Genius

In the know about (4)

Ross

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4

5
upon

onto

(Other definitions for onto that I've seen before include "forward, with a destination" , "(Moving) aboard" , "To a place on" , "In contact with - aware of" , "To the whole of (maths.)" .)

I've seen this clue in the Penny Press, the USA Today, the Universal, the LA Times and the Newsday.
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