Crossword Genius

Going by air is pretty quick (5)

Ross

I believe the answer is:

swift

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'quick' is the definition.
(I've seen this in another clue)

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

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(Other definitions for swift that I've seen before include "Anglo-Irish satirist" , "Fast-moving bird" , "like a peregrine falcon?" , "flying" , "Jonathan . . . . . wrote 'Gulliver's Travels'" .)

I've seen this clue in the Evening Standard.
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