Possible Clues:

• Toy with some fish, say? It's not a fish
• Don keeps Phil off this creature
• No good holding stew containing pea, say, one in a pod?
• One supposedly intelligent policeman unkindly rejected short clue
• Marine mammal that makes bubble rings
• Bottlenose mammal?
• Strangely upholding skinless mammal, in the main
• PC turns up, greeting northern sea creature
• Pile or buoy for mooring boats
• Brief suggestion by retired police officer for swimmer