Greek character opposing Italian wine (7)
I believe the answer is:
chianti
'italian wine' is the definition.
(I've seen this before)
'greek character opposing' is the wordplay.
'greek character' becomes 'chi' (letter from the Greek alphabet).
'opposing' becomes 'anti'.
'chi'+'anti'='CHIANTI'
(Other definitions for chianti that I've seen before include "Italian wine variety" , "European wine" , "I can hit (anag) - alcoholic drink" , "Wine produced in Tuscany" , "Chain it to popular Italian wine" .)