Possible Clues:

• Responsibility parson usually embraces
• Something burdensome, like the round of drinks we buy
• … a burden borne by Americans?
• Obligation around North America
• Greek character overwhelmed by huge responsibility
• Old students' burden of debt?
• Burden we'll pay for?
• Old students' group -- a liability
• Burden of our financial responsibility
• Responsibility of crossword setters?