Crossword Genius

Gas used in balloons (6)

Ross

I believe the answer is:

helium

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

(Other definitions for helium that I've seen before include "Atomic number 2" , "... ditto: symbol He" , "Light colourless gas used in balloons" , "Light colourless gas, sometimes in balloons" , "Floating balloon gas" .)

I've seen this clue in the Sydney Morning Herald and The Guardian.
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