Related Clues:

• Piece of postage
• Inverted Jenny is a rare one
• PAID, for one
• Be ill-humored
• Characteristic mark
• Protruded-lip expression
• It's usually stuck in a corner
• Snail-mail need
• Licked square
• Christmas-song verb
• Be a sore loser, in a way
• Make a sad face
• Envelope stick-on
• Perforation site
• Mailing need