Possible Clues:

• Whale of a way to have hurried back with most of the whale
• Hurried over to find most of whale, tusked whale
• Animal with large spiral tusk
• How to warn Henry to a whale of an extent
• Marine mammal with single tusk
• It's a whale of a thing to have to ward Hal like this
• Swimmer managed to get up to start when help arrived laughing
• Arctic whale with the male having a long twisted ivory tusk
• Whale, the male of which has a spiral tusk
• Sea creature prince smuggled back west initially