Crossword Genius

Dangerous gas (5)

Ross

I believe the answer is:

radon

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

This is the entire clue.

(Other definitions for radon that I've seen before include "Noble gas, Rn" , "Radioactive gas, linked to granite" , "Gaseous element, Rn" , "A radioactive gas, symbol Rn" , "Natural gas considered a hazard to health" .)

I've seen this clue in the King Feature Syndicate.
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