Possible Clues:

• Something misplaced in time
• For instance, in costume drama a digital watch that gets the date wrong
• Misplace a Cornishman such as Trevithick going via Eurostar?
• A thing out of its time
• A case of mixed dates
• Chairman and son in conflict, one seemingly from another era?
• Untimely mistake?
• A Cornishman making untimely error
• A Cornishman is strange, old-fashioned chap