It's quite fair to sing about wine (8)
I believe the answer is:
sporting
'it's quite fair' is the definition.
I can't judge whether this defines the answer.
'sing about wine' is the wordplay.
'about' indicates putting letters inside.
'wine' becomes 'port' (port wine is a kind of wine).
'sing' going around 'port' is 'SPORTING'.
'to' is the link.
Can you help me to learn more?
(Other definitions for sporting that I've seen before include "game" , "Able to take defeats in good part" , "Diver's point of departure" , "Fair (chance)" , "Fair and generous" .)