Crossword Genius

Helium or hydrogen (3)

Ross

I believe the answer is:

gas

This clue is a double definition.

'helium' is the first definition.
(I've seen this in another clue)

'hydrogen' is the second definition.
(hydrogen is a gas)

(Other definitions for gas that I've seen before include "Idle chat" , "could be embarrassing for American" , "Substance like air" , "Hydrogen, for example" , "person who's amusing ..." .)

I've seen this clue in the USA Today.
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