Crossword Genius

Gas — organ (anag) (5)

Ross

I believe the answer is:

argon

(Other definitions for argon that I've seen before include "Inert gas, symbol Ar" , "Noble gas used in light bulbs" , "noble element" , "Gas, inert constituent of air" , "something inert and insubstantial" .)

I've seen this clue in The Guardian.
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