Crossword Genius

Gang __; attack with others

Ross

I believe the answer is:

upon

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

I've seen this clue in The Mirror.
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