Related Clues:

• Pro ___
• Wake-up times: Abbr.
• Clock settings
• Mornings, for short
• Some clock-radios, or their settings
• Early hrs.
• See 72-Across
• ___-tat
• Some radios
• Radio settings
• Tat-tat preceder
• One-named rock singer
• See 58-Down
• See 38-Across
• 12-hr. stretches