Crossword Genius

Gas vital for life (6)

Ross

I believe the answer is:

oxygen

(Other definitions for oxygen that I've seen before include "Atmospheric gas" , "Gas discovered by Joseph Priestley, d. 1804" , "Gas forming about 20 per cent of atmosphere" , "publicity, perhaps" , "Second commonest element in air" .)

I've seen this clue in The Times.
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