Crossword Genius

After short run do oppose the surge (5)

Ross

I believe the answer is:

flood

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'the surge' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for flood that I've seen before include "Inundate" , "Overflow of water" , "Oversupply" , "Light" , "Inundation" .)

I've seen this clue in The Hindu.
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