Possible Clues:

• Channel for 29-Across
• Where vessels may be made of tin and aluminium
• Calexico might float down one with a "Book"
• Writer leaves maneater in locked passage
• Cruise ship band might play down one
• Ditch by a lake and waterway
• Gondolier's locale
• Erie or Suez
• Venetian thoroughfare
• Word following Erie or Rideau