Crossword Genius

Whoopee cushion filler (3)

Ross

I believe the answer is:

air

'whoopee cushion filler' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for air that I've seen before include "- - on a G-string" , "Outward appearance" , "A tune or attitude" , "Spread publicity" , "Bearing, manner" .)

I've seen this clue in the Wall Street Journal and the USA Today.
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