Crossword Genius

Balloon gas (6)

Ross

I believe the answer is:

helium

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

(Other definitions for helium that I've seen before include "Balloon-filling element" , "Light colourless gas used in airships" , "Second lightest element" , "Lightest noble gas" , "Light colourless gas used in balloons" .)

I've seen this clue in the King Feature Syndicate, the Evening Standard, The Mirror, the LA Times and The Daily Mail.
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