Crossword Genius

Very keen to attack (3,4)

Ross

I believe the answer is:

set upon

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'attack' is the definition.
(I know that set upon is a type of attack)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

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

I've seen this clue in The Globe and Mail.
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