Related Clues:

• Mailer's need
• Look of displeasure
• Stew in one's own juices
• Keep a stiff lower lip?
• Snail mail attachment
• Snail mail need
• Emboss
• Bad mood
• Show grumpiness
• Post-office purchase
• Postage purchase
• Hallmark
• Philatelist's love
• It may be licked
• Show impatience, in a way