Crossword Genius

Air up there

Ross

I believe the answer is:

ether

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

This is all the clue.

(Other definitions for ether that I've seen before include "Medium supposedly" , "The gas is there, oddly" , "Once widely-used anaesthetic" , "An early anaesthetic" , "number" .)

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