Possible Clues:

• Perfectly detailed model
• Quietly slipped into saint's memorial with a copy
• Copy original recipe, cooking plaice
• Knockoff
• Agent left London gallery a copy
• Copy I place wrongly under back of printer
• Model I wrapped in oddly shaped parcel
• Hangover a Pimm's No 1 cuts through — same again?
• I parcel (anag) — reproduction
• Mayflower model, e.g.