Crossword Genius

Argon or radon (3)

Ross

I believe the answer is:

gas

This clue is a double definition.

'argon' is the first definition.
(thesaurus)

'radon' is the second definition.
(thesaurus)

(Other definitions for gas that I've seen before include "It may be natural" , "16 (US)" , "Something exciting" , "Chat (colloq.)" , "Neon, for example" .)

I've seen this clue in the Canadiana and the King Feature Syndicate.
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