Possible Clues:

• Oregon Ducks' home
• Oregon's 'Emerald City'
• Reportedly, you first book, then finally take in an opera, but only first half
• — Onegin, opera by Tchaikovsky
• -- O'Neill, US dramatist awarded Nobel Prize for Literature in 1936
• Debs in politics
• City south of Portland
• Second-most-populated city in Oregon
• Ormandy or O'Neill
• With 119-Across, 1920's literary couple on Cape Cod, with 'the'