Possible Clues:

• Five hundred and six balls held in seaside town
• Making a note on old port
• Port finally imbibed in excess
• Sole source
• Departs to the other side - from here?
• Be aware of
• Roved into English port
• Beach on which Matthew Arnold heard the pebbles' 'grating roar'?
• White cliffs port
• On what did Arnold hear the sea's eternal note of sadness?