Related Clues:

• Disagreeable obligation
• The heavens, to Atlas
• Unpleasant responsibility
• It's hard to bear
• Burden or responsibility
• Unpleasant necessity
• Unwelcome obligation
• "We're treating"
• Duty that's a drag
• Weighty obligation
• Unpleasant burden
• Laborious effort
• Heavy duty
• Unpaid debt, e.g.
• Obligation (or where it might fall?)