Possible Clues:

• Graveyard slab
• 'It's engraved over the engraved, perhaps (9)'
• It marks a grave
• Person after death's represented — here?
• ... leader's character shown in monumental error?
• Slab marking a grave
• The sad sculpture beneath which I must go?
• Call to Newcastle area for memorial
• Slab set at the head of a grave
• Memorial is at the top end of quality