Crossword Genius

Empty talk out of the ring? (3)

Ross

I believe the answer is:

gas

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'empty talk' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

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(Other definitions for gas that I've seen before include "Oxygen maybe" , "eg Helium" , "Fumes, vapour" , "idle chit-chat" , "Talk profusely" .)

I've seen this clue in the Evening Standard.
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