Crossword Genius

Chemical element (5)

Ross

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

This is all the clue.

(Other definitions for argon that I've seen before include "Gas used in electric lights" , "Inert gas used in light bulbs" , "something inert and insubstantial" , "Gaseous element" , "An insert gas to groan about" .)

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