Possible Clues:

• A Cornishman (anag) — one is no longer relevant
• Untimely error upsets a Cornishman
• Thing that belongs to another time
• Non-archaism wrongly placed?
• Something appearing in the wrong time
• Something out of its time
• Item that could not have occurred when said
• Anchorman is rewriting an outdated item
• Something belonging to another time
• Untimely error possibly made by a Cornishman