Possible Clues:

• Does the creature claim to be an island on the water?
• Hull's where a pussy cat made off to
• How a mother hurried after an 11 across over the water
• Vessel with paralleltwin hulls
• Boat can, crossing a West Country river
• The accountant, thanks to Mother, hurried over the water (9)
• Twin-hulled boat (Last three letters + ...)
• How a mother pussy scampered over the water
• Boat with twin, parallel hulls
• How mother pussy sprinted for the hulls?