Wine imported by great champion (9)
I believe the answer is:
supporter
'champion' is the definition.
(I know that champion can be written as supporter)
'wine imported by great' is the wordplay.
'wine' becomes 'port' (port is a kind of wine).
'imported by' indicates putting letters inside.
'great' becomes 'super' (both can mean excellent).
'port' inserted inside 'super' is 'SUPPORTER'.
(Other definitions for supporter that I've seen before include "One cheers" , "One helping" , "Strut" , "angel" , "Second" .)