It's all around you (4)

I think it could be either:

Which length description are you looking for?:

air

'it's all around you' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for air that I've seen before include "Of which 78% is nitrogen" , "Skye Boat Song, perhaps" , "Tune (on the G string?)" , "Look - warm and dry" , "Atmosphere; appearance" .)

I've seen this clue in the New York Times, The Washington Post, the L.A. Times Daily and the Universal.

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