Possible Clues:

• Pin-up sought by angler is a pretty marine type?
• Has rifts (anag)
• Tide pool dweller
• Lead search for marine creature
• Creature mainly living from fir nuts collected by squirrel
• Celebrity cast found lying on a beach at Cannes, for instance
• Informers upset by those from school lying about the beach
• Spiny sea creature with five or more arms
• His raft's ruffled sea creature
• Sea creature with five arms