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Sudden increase (7)


I think it could be either:

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'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 Telegraph and the Sydney Morning Herald.
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