Possible Clues:

• 'Take a long walk off a short ___!'
• Support confusion at start of Rheingold
• Port structure
• Milord goes out to sea, by the sound of him
• The pinnace stops here
• Coastal platform
• 'Dock, wharf (4)'
• Musician ignoring piano support
• "... walk off a short ___"
• Part of airport terminal; breakwater