Crossword Genius

Air alternative (4)

Ross

I believe the answer is:

rail

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

This is all the clue.

(Other definitions for rail that I've seen before include "Complain vehemently" , "Bar - marsh bird" , "Bird with long legs" , "The Iron Horse road" , "20 backwards, that 7 runs on" .)

I've seen this clue in The New York Times.
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