Nitrogen and hydrogen compound (7)

I believe the answer is:

ammonia

(Other definitions for ammonia that I've seen before include "Pungent cleaner" , "Pungent gas used in the manufacture of fertiliser" , "Pungent gas, NH 3" , "Colourless pungent gas" , "Pungent cleaning fluid" .)

I've seen this clue in The Guardian.

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