Related Clues:

• Undo
• Remove a slip?
• Remove from a disk
• Nullify
• Take-out order?
• Clear, as a disk
• Wipe, as a blackboard
• Make blank
• Prepare for reuse, perhaps
• Efface
• Wipe clean
• Rub off
• Show fallibility
• Remove lead
• Demagnetize a diskette