Crossword Genius

Airy talk (3)

Ross

I believe the answer is:

gas

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'talk' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for gas that I've seen before include "person who's amusing ..." , "Talk profusely" , "Carbon dioxide, say" , "Form of fossil fuel" , "Oxygen is one" .)

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