Crossword Genius

Hydrogen or helium (3)

Ross

I believe the answer is:

gas

This clue is a double definition.

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

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

(Other definitions for gas that I've seen before include "Idle chat" , "Petrol (US)" , "eg CO2" , "What's needed to drive" , "natural resource" .)

I've seen this clue in The Wall Street Journal and the USA Today.
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