Crossword Genius

Attack in a manner that may increase rapidly? (5,2)

Ross

I believe the answer is:

shoot up

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'increase rapidly?' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for shoot up that I've seen before include "Grow quickly" , "Maybe inject" .)

I've seen this clue in the Evening Standard.
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