Crossword Genius

Freon, e.g. (3)

Ross

I believe the answer is:

gas

(Other definitions for gas that I've seen before include "could be embarrassing for American" , "What's needed to drive" , "Carbon dioxide, say" , "Possibly noble" , "Chat (colloq.)" .)

I've seen this clue in the Penny Press and The Star Tribune.
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