Crossword Genius

Fly through plant in the swamp (4)

Ross

I believe the answer is:

I'm a little stuck... Click here to teach me more about this clue!

'fly' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for rush that I've seen before include "Liverpool footballer once", "Spate", "High", "Lose no time", "Hasten; plant".)

I've seen this clue in Sydney Morning Herald.