Conservatory gossip on carbon dioxide, say (10,3)
I believe the answer is:
greenhouse gas
'carbon dioxide say' is the definition.
(I know that CO2 is a type of greenhouse gas)
'conservatory gossip on' is the wordplay.
I cannot quite see how this works, but
'gossip' could be 'gas' (I've seen this before) and 'gas' is located in the answer.
'on' could be 're' (regarding) and 're' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for greenhouse gas that I've seen before include "Contributor to global warming" , "Carbon dioxide, for example" , "Carbon dioxide, say" , "Carbon dioxide is one" , "will affect the climate" .)