Possible Clues:

• Poland's main seaport
• Southern Baltic Sea port
• Baltic port in Poland
• Drifting sand blocks Greek port
• Some drinking Dan's knockout port
• City of Poland
• Lech Walesa formed Solidarity in this Polish city
• Polish shipyard city
• Around kilometre from Dublin, it's an unseen problem for the port
• Grapes primarily from bottom of the slopes in unpleasantly damp and cold port