Related Clues:

• The time of one's life?
• Trendy
• Not up to snuff
• Time in history
• Concert ending
• See 6-Down
• Watered-down
• Get hoary
• ___ nutshell
• What candles may signify
• See 36-Across
• Well-kept secret, for some
• In
• ___ heartbeat (instantly)
• All the rage