Related Clues:

• Spill guard
• It's flipped when you flip
• It may be flipped
• A-one
• Upper portion
• Pop-top, for one
• Shirt or sweater
• Container cover
• Eye shade?
• Lid
• Part of a jack-in-the-box
• Lash locale
• Pajama part
• Piece of Tupperware
• Shut-eye shutter