Related Clues:

• Amounting to nothing
• Brought to ruin
• Wiped the slate clean
• No longer on the board
• Opened, as a fastener
• Disengaged
• -- and void
• Partner of void
• Got rid of marks
• Cleared the board
• Cleaned, as a blackboard
• Without force
• Helped with the blackboard
• ___ and void
• Bleeped out