Crossword Genius

Nitrous oxide (8,3)

Ross

I believe the answer is:

laughing gas

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nitrous oxide</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for laughing gas that I've seen before include "Mild anaesthetic used in dentistry and surgery" , "it'll knock you out" , "Name for nitrous oxide" , "Early anaesthetic; nitrous oxide" , "Old number" .)

I've seen this clue in The Independent, The Mirror and the Evening Standard.
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