Related Clues:

• Albatross
• Millstone, e.g.
• Worrysome thing
• Encumbrance, so to speak
• Burdensome bird
• Difficult obligation
• The sky, to Atlas
• Daunting duty
• Responsibilty
• Worrisome thing
• Heavy load
• Ancient Mariner's burden
• Burden sometimes "on you"
• Disagreeable obligation
• The heavens, to Atlas