A pungent gas, also used with water added (7)

I believe the answer is:

ammonia

(Other definitions for ammonia that I've seen before include "pungent chemical" , "Pungent gas, NH 3" , "Gas released by smelling salts" , "Pungent gas used in cleaning liquids" , "Gas; cleaning fluid" .)

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

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