Xenon or argon (3)

I believe the answer is:

gas

I believe this clue is a double definition.

'xenon' is the first definition.
(thesaurus)

'argon' is the second definition.
(thesaurus)

(Other definitions for gas that I've seen before include "Fuel; idle talk" , "Oxygen is one" , "Talk profusely" , "rabbit" , "Chatter (colloq.)" .)

I've seen this clue in the USA Today.

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