Crossword Genius

Unreactive element of the rare gas series used in electric lights; symbol Ar (5)

Ross

I believe the answer is:

argon

(Other definitions for argon that I've seen before include "something inert and insubstantial" , "Inert gas, symbol Ar" , "Organ (anag.)" , "Inert gas used in light bulbs" , "Inert gas in atmosphere" .)

I've seen this clue in The Mirror.
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