Colourless pungent highly soluble gas whose formula is NH3 (7)

I believe the answer is:

ammonia

(Other definitions for ammonia that I've seen before include "Colourless pungent gas" , "Pungent gas used in cleaning liquids" , "Pungent cleaning fluid" , "Gas compounded of nitrogen and hydrogen, NH3" , "Gas; cleaning fluid" .)

I've seen this clue in The Independent.

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