Related Clues:

• Difficult obligation
• Goods carried by a large vehicle
• The sky, to Atlas
• IRS concern
• Daunting duty
• Responsibilty
• Worrisome thing
• Receipt line
• Take a toll on
• Purchase add-on
• Heavy load
• Burden sometimes "on you"
• Word on two Monopoly squares
• Ton of bricks, e.g.
• Fill, as a camera