Crossword Genius

Sudden increase (7)

Ross

I think it could be either:

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5

7

upsurge

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

This is all the clue.

(Other definitions for upsurge that I've seen before include "Sudden rapid increase" , "Sudden or abrupt strong increase" , "Sudden forceful flow from below" , "Effect of groundswell" , "Rapid rise" .)

I've seen this clue in The Guardian, the Sydney Morning Herald and The Telegraph.
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