Related Clues:

• Snake shape
• Spring, essentially
• Snake's posture, sometimes
• Rattlesnake's shape
• Philatelist's concern
• Piece of postage
• Inverted Jenny is a rare one
• PAID, for one
• Characteristic mark
• Emulate a snake
• Form rings
• It's usually stuck in a corner
• Snail-mail need
• Slinky, essentially
• Licked square