Related Clues:

• Boxcars
• Top of a clock dial
• Sundial letters
• It's at the top of a face
• See 39-Across
• Most people are asleep then
• Twelve
• Clock numeral
• Midnight, on a grandfather's clock
• Hour on a clock
• It's atop a face
• Jury, often
• Top of a dial
• Clock number
• Number