Crossword Genius

Dangerous gas (5)

Ross

I believe the answer is:

radon

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dangerous gas</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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, the Penny Press and the USA Today.
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