Possible Clues:

• Glinda in ''The Wiz''
• Young filmmaker Dunham
• Horne with plenty of talent
• 2,779-mile-long Russian river
• Olin of 'Havana'
• Blues legend Horne
• Russian river to the Laptev Sea
• Actress Dunham who wrote 'Not That Kind of Girl'
• With 37-Across, "Alias" actress
• Dunham of 'Girls' fame