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Inert gas (5)

Ross

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4

5

7 4,6

'inert gas' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Sun, The Mirror, The Independent, The Times, The Guardian, the Evening Standard, the Penny Press, The Star Tribune, the King Feature Syndicate and The Telegraph.
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