Possible Clues:

• Artificial waterway as for barges
• Locks locale
• Sounds as if Sue is one that has a lock
• Duct made of tin and aluminium
• Is a half-century able to go the way of the water?
• Setting of some locks
• Is a pound able to make way for the water
• Where one might take a lock-up
• Artificial waterway as at Panama (5)
• Odd type of chain-mail found in waterway