Related Clues:

• Inverted Jenny is a rare one
• PAID, for one
• It's on the back of the $1 bill
• Manitoba river
• See 24 Across
• Aquarium clapper
• Notary's device
• Animal with pups
• Finalize, so to speak
• Close for security
• Word with ''state'' or ''great''
• Characteristic mark
• It's on the president's lectern
• It's usually stuck in a corner
• Snail-mail need