Gas coming from some decaying oranges? (5)
I believe the answer is:
argon
'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" .)