Related Clues:

• 'This round's ___'
• Unpleasant burden
• ''The drinks are ___!''
• ''This one's ___'' (''my treat'')
• Def Leppard hit 'Pour Some Sugar ___'
• ''The joke's ___''
• Heavy duty
• Unpaid debt, e.g.
• Obligation (or where it might fall?)
• "Dinner is __"
• Elton John's 'Don't Let the Sun Go Down ___'
• 'Down ___' (1967 Janis Joplin song)
• "I'm treating"
• 'Call ___' (1974 hit)
• Unpleasant duty