Related Clues:

• Brought to naught
• Proved false
• Disassembled
• Opened, as a tie
• Took apart
• Annulled
• Brought to ruin
• Opened, as a fastener
• Disengaged
• Made ineffective
• Loosened, as a 57-Down
• Opened, as a necktie
• Unfastened
• Prove to be false or incorrect
• So to have got in with a dud made one loose