Possible Clues:

• ''Jaws'' menace
• Craft takes high water around edge of reef, a hidden danger at sea
• I gawk at thresher at sea, a predatory creature
• Predacious type in water rakes thigh -- beat it!
• Seal hunter
• Intimidating swimmer
• "Jaws" menace
• Massive winner in point-to-point for expert punter - it's certainly not from the jaws of defeat?
• In high water, takers for a swim? Not with him
• Two-ton predator