Crossword Genius

Hydrogen, e.g (3)

Ross

I think it could be either:

Which length description are you looking for?:

3

7*

gas

(Other definitions for gas that I've seen before include "Petrol (USA)" , "See 2" , "Eg, oxygen" , "Domestic fuel" , "Chatter vapidly" .)

I've seen this clue in the Universal, The Telegraph, The Washington Post, the USA Today and The Sun.
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