Possible Clues:

• Destabilized
• Mentally unbalanced
• Unbalanced doors have been taken off
• It would be mad to have a door like this
• Likely to go mad, being in need of a joint?
• Bats like sliding doors?
• Perhaps removed door with a screw loose?
• Bananas
• Mad, ensured children could no longer swing on gate?
• A Parisian complained after leader's dismissed eccentric