Possible Clues:

• Ex-U.N. chief Annan
• U.N. head between Boutros and Ban
• - - Annan (UN)
• The U.N.'s ___ Annan
• Annan of the U.N.
• Boutros' successor
• UN chief Annan
• Annan's forename
• Former U.N. chief Annan
• First name in international diplomacy