Related Clues:

• Flat surface for holding things
• Ledge for holding things
• Support for holding objects
• Horizontal surface for objects
• Flat rectangular structure in house for putting things on
• Writing tips of old pens
• Storage ledge
• The sort of spare Gs one objects to, perhaps
• His ones would be grand enough to do the writing
• His would be for the boss of the writers
• His might be tops when it comes to writing
• His for the boss for the writers
• With their help His Lordship will write
• His ones make him tops for writing (4)
• It's sticking out that one is telling the spirits to be quiet