Related Clues:

• Duty that's a drag
• Weighty obligation
• Unpleasant burden
• Heavy duty
• Unpaid debt, e.g.
• Obligation (or where it might fall?)
• "Drinks are __"
• Unpleasant duty
• Great burden
• Major burden
• Large burden
• Great responsibility
• Daunting burden
• Woeful burden
• Heavy duty?