Crossword Genius

Swift – doing what it does? (6)

Ross

I believe the answer is:

flying

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'swift' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for flying that I've seen before include "Taking flight" , "Moving quickly" , "Famous train once from King's Cross" , "Moving rapidly; brief" , "UFO" .)

I've seen this clue in The Guardian.
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