Crossword Genius

Gas coming from some decaying oranges? (5)

Ross

I believe the answer is:

argon

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for argon that I've seen before include "Organ (anag.)" , "noble element" , "Inert eighteen ac gas" , "Gas, 1% of atmosphere" , "Noble gas, Ar" .)

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