Crossword Genius

Chemical element (5)

Ross

'chemical element' is the definition.
(I know that radon is a type of chemical element)

This is the entire clue.

(Other definitions for radon that I've seen before include "Radioactive gas, linked to granite" , "Element, symbol Rn" , "Colourless gas, atomic number 86" , "hazardous substance" , "Inert gas that occurs naturally" .)

I've seen this clue in the Penny Press and The Telegraph.
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