Crossword Genius

Pungent gas (7)

Ross

I believe the answer is:

ammonia

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pungent 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 ammonia that I've seen before include "Pungent cleaning fluid" , "Pungent gas used in the manufacture of fertiliser" , "Gas compounded of nitrogen and hydrogen, NH3" , "Nitrogen-hydrogen gas" , "Pungent gas used in cleaning liquids" .)

I've seen this clue in The Guardian, The Independent and The Times.
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