Possible Clues:

• Device for fastening paper, basic? Right
• Office equipment whose contents are typically 26/6
• Gone off to cover initial posting with resistance and grips the papers in one go
• One working in a corner in an office?
• Office gadget wrecked plaster
• Desk device
• Metal fastener
• Something to secure psalter that's falling apart?
• Office equipment — plaster (anag)
• Item of office equipment