Crossword Genius

Vital gas (6)

Ross

I believe the answer is:

oxygen

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vital gas</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for oxygen that I've seen before include "life support" , "Twist together" , "Gas that supports life" , "A constituent of water" , "Gaseous element supporting combustion" .)

I've seen this clue in The Guardian, The Times, the Sydney Morning Herald, The Mirror, The Telegraph and The Independent.
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