Crossword Genius

A gas (8)

Ross

I believe the answer is:

nitrogen

'a gas' is the definition.
(nitrogen is a kind of gas)

This is the entire clue.

(Other definitions for nitrogen that I've seen before include "Inert nog is an inert gas" , "Main element of air" , "Commonest atmospheric gas" , "Most prevalent gas in air" , "that's dominant in the air" .)

I've seen this clue in The Telegraph.
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