Related Clues:

• Perfect start?
• Historian's interest
• Put a stop to
• Time machine's destination
• Silent, now
• Bygone period
• Over, slangily
• One of the ghosts of 34-Across
• Future's opposite
• Came to a close
• Nostalgic time
• Like some practice
• Pulled the plug on
• Tense description?
• Finalized