Possible Clues:

• Barrier visited by tourists
• Underwater structure needs real force to break
• Recycling of clearer water vital to its survival
• Yachting hazard
• Navigational hazard in warm seas — real force (anag)
• Offshore bank said to be in credit before payment returned?
• Snorkeling site
• Scuba diver's lure
• Waugh protagonist offering small change with a light touch
• Endangered ecosystem