Related Clues:

• Morning ender
• They grow from acorns
• When a factory whistle may blow
• Busy time for a cuckoo clock
• Acorns, after time
• Lunchtime for many
• One before one
• When many lunch whistles blow
• "High" time at MGM
• What may precede one
• Whistle time?
• XII, perhaps
• Palindromic time of day
• It may follow eleven
• Flooring trees