Greek character against Italian wine (7)
I believe the answer is:
chianti
'italian wine' is the definition.
(I've seen this before)
'greek character against' is the wordplay.
'greek character' becomes 'chi' (letter from the Greek alphabet).
'against' becomes 'anti' (prefix meaning against).
'chi'+'anti'='CHIANTI'
(Other definitions for chianti that I've seen before include "Italian wine - mountain range" , "Chain it to popular Italian wine" , "Wine produced in Tuscany" , "Italian offering" , "Dry red Italian wine" .)