Possible Clues:

• Five-armed sea creature
• Sea urchin's cousin
• Five-armed creature
• Informers upset by those from school lying on the beach
• Five-armed creature, a brilliant swimmer?
• Five-armed marine creature
• Beachcomber's find
• Fir moved into store that has several arms, mainly
• US college groups picked up kind of marine creature
• The marine creature is fairly quick, according to Spooner