Related Clues:

• Mailer's need
• Signet
• Shut up tight
• Circus performer, perhaps
• Affix a kiss?
• Organizational symbol, perhaps
• Close hermetically
• Walrus' cousin
• Snail mail attachment
• Snail mail need
• Official emblem
• Use wax on
• Emboss
• Close up tightly
• Flippered mammal