Crossword Genius

Fly through plant in the swamp (4)

Ross

I believe the answer is:

rush

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'fly' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for rush that I've seen before include "Be too hasty or too fast" , "Stampede - marsh grass" , "candle" , "Dash to the grassy plant" , "Charge" .)

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