Related Clues:
- Not a light matter and not for 5 down
- Noon to noon
- Appointment-calendar page, perhaps
- Word with trip or light
- "Let's call it a ___"
- Week component
- Every second from a diary unit?
- Square on a calendar
- Desk-calendar page
- One of seven in a week
- Generally preferred work shift
- Light interval
- Midnight to midnight
- One revolution
- 1/14 of a fortnight