Crossword Genius

Gush up (7)

Ross

I believe the answer is:

upsurge

(Other definitions for upsurge that I've seen before include "Effect of groundswell" , "Sudden forceful flow from below" , "A sudden rise, as in business" , "Hike" , "A sudden rise as in fortunes" .)

I've seen this clue in the Sydney Morning Herald.
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