Crossword Genius

Organ producing gas (5)

Ross

I believe the answer is:

argon

'gas' is the definition.
(argon is a gas)

'organ producing' is the wordplay.
'producing' indicates an anagram.
'organ' anagrammed gives 'ARGON'.

(Other definitions for argon that I've seen before include "An insert gas to groan about" , "Chemical element" , "Inert gas, present in small amounts in the air" , "something inert and insubstantial" , "Noble gas, Ar" .)

I've seen this clue in the Evening Standard.
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