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Inert gas (5)

Ross

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7 4,6

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

This is all the clue.

(Other definitions for argon that I've seen before include "something inert and insubstantial" , "Inert gas, symbol Ar" , "Chemical element" , "Inert gas used in light bulbs" , "Gas, 1% of atmosphere" .)

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