Crossword Genius

Harmful gas

Ross

I believe the answer is:

radon

'harmful gas' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for radon that I've seen before include "Gaseous element, Rn" , "hazardous substance" , "gets no reaction" , "Natural gas considered a hazard to health" , "Colourless gas, atomic number 86" .)

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