Crossword Genius

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Ross

I believe the answer is:

upon

(Other definitions for upon that I've seen before include "Supported by (a surface)" , "'''It came ... the midnight clear'' (carol) (4)'" , "At a prescribed point in time" , "Carried - on top" , "Children's tales may begin ` `Once .... a time' '" .)

I've seen this clue in The New York Times.
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