Possible Clues:

• Minister pursuing sailor in Belgian port
• Sort of map with diamonds shown by X somewhere in Europe
• Seaman meets nurse in foreign port
• That's the last of the broken sot on the Continent
• Largest city on the Belgian coast
• Belgian seaport
• Port — doesn't (anag)
• Going from Ringway to finish in Belgian port
• So reverse and incline to port
• Sent as soldiers, though lacking power to capture Northern port