Possible Clues:

• There are piles of it in the sea
• Crafty target?
• A landing stage or promenade
• One jutting into sea
• Wharf or pillar
• Ripe on a jetty
• Place on piles
• Wharf jutting out into water
• Sounds as if the sound of 28 down is in the water
• Where to alight from a lighter