Related Clues:

• Close tightly - mammal
• Close up - marine mammal
• Marine animal
• Authenticating stamp
• Fancy stamp
• Horn-honking animal
• 59-across's ex
• Sea lion, e.g
• SeaWorld barker
• Swimmer with pups
• Clapping animal
• ___ of approval
• Imprinted disk affixed to a document
• Dollar bill feature
• ''Great'' place to see 20 Across