Crossword Genius

Attack outspoken drunk? Not OK (3,4)

Ross

I believe the answer is:

set upon

'attack' is the definition.
(I know that set upon has the is a more specific form of the action attack)

I don't understand how the rest of the clue works.

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

I've seen this clue in The Times.
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