Colourless, acrid-smelling gas, NH3 (7)

I believe the answer is:

ammonia

(Other definitions for ammonia that I've seen before include "Gas released by smelling salts" , "pungent chemical" , "Pungent gas used in cleaning liquids" , "Pungent cleaning fluid" , "Powerful cleaner" .)

I've seen this clue in The Guardian.

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