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Noble gas (5)

Ross

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'noble 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 "hazardous substance" , "Naturally occurring inert gas" , "Colourless gas, atomic number 86" , "Inert gas - adorn (anag)" , "Rare noble gas" .)

I've seen this clue in the Penny Press, the King Feature Syndicate, The Guardian, the Sydney Morning Herald, The Mirror and The Times.
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