Possible Clues:

• Copy
• Old copy
• Pot shot at poorly reproduced copy
• Copy useless to shop, worthless stuff
• Post Office admitting stolen figure's a facsimile
• Apparatus for making facsimile copies
• Letters to keep burning? I'm obliged to return copy
• Copy letters capturing passionate heart of relative
• Mail includes recent article on Tory leader (copy)
• (Issued quarterly) copy@hotmail circulating, given priority