Agrees enough’s converted into methane maybe (10,3)
I believe the answer is:
greenhouse gas
'methane maybe' is the definition.
(I know that methane is a type of greenhouse gas)
'agrees enough's converted' is the wordplay.
'converted' indicates an anagram.
'agrees'+'enoughs'='agreesenoughs'
'agreesenoughs' is an anagram of 'GREENHOUSE GAS'.
'into' acts as a link.
(Other definitions for greenhouse gas that I've seen before include "Carbon dioxide, for example" , "will affect the climate" , "Carbon dioxide, say" , "Carbon dioxide is one" , "Contributor to global warming" .)