Crossword Genius

Odourless gas (5)

Ross

I believe the answer is:

radon

(Other definitions for radon that I've seen before include "A radioactive gas, symbol Rn" , "Element, symbol Rn" , "gets no reaction" , "Colourless gas, atomic number 86" , "Inert gas - adorn (anag)" .)

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