Possible Clues:

• The drink a chap mostly gets on credit, do we hear?
• Split is such a port
• Fallout of radiation, but not on cold sea
• Sea bordering Italy
• The sea between Italy and former Yugoslavia
• The main threat to Venice: mad raid by heartless Greek
• It is mainly between Italy and the Balkan States
• Montenegro's locale
• Sea between Italy and the former Yugoslavia
• The Strait of Otranto connects to it