Crossword Genius

Attack (6)

Ross

'attack' is the definition.
(setting upon is a kind of attacking)

This is the entire clue.

(Other definitions for set upon that I've seen before include "Attacked" , "Determined to do (something)" , "Mug" , "Attack" .)

I've seen this clue in the Evening Standard, the Penny Press and The Wall Street Journal.
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