Possible Clues:

• (Unusual) collector's item
• Dog no-one backed was something unusual
• Scientist has base taken off round collector's item
• Bibelot
• Quaint collectible
• Brute Number Ten for the collector
• Copper has curtailed disturbance - it's an odd thing
• Inquisitive American leaving rare object
• Small fascinating collectible object
• The tenth wretched thing for the collector