Related Clues:

• Act on grand old committee, having a short spell on board
• 16:00 to 20:00, on a boat
• Night shift of a sort
• Pursue wife at church given duty for rating?
• Follow timepiece for two hours on duty
• Plague hunter possibly gets two-hour shift
• A couple of hours pet-sitting?
• Maritime shift of 4-6pm or 6-8pm