Possible Clues:

• Furniture that's assembled in Number Ten
• Type of cupboard
• Cupboard for storing or displaying things
• Cupboard; committee
• About to help around home, making cupboard
• It can hold its liquor
• Word that can follow the first parts of 20- and 58-Across and 11- and 29-Down
• Advisory panel
• File holder
• Takes fare from one online for the Government