Crossword Genius

Brief encounter, throwing first dart (4)

Ross

I believe the answer is:

rush

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'dart' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for rush that I've seen before include "Stampede - marsh grass" , "Hurry to the wetland grass" , "Race" , "Hurry, surge" , "Hurry - marsh plant" .)

I've seen this clue in The Daily Express.
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