The Nielsen Three

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Across
  1. 2. Low land of know-it-alls
  2. 3. Duty before work week arrives
  3. 5. Saturday Night Fever food
  4. 9. Short, demanding green lady who annoys Erika
  5. 10. Where the River Birch live
  6. 12. Across the pond, plus a smaller body of
  7. 13. Twyla's musical aroma
Down
  1. 1. Vienna's tall case near us
  2. 4. When a volunteer is reduced to beggar
  3. 6. Occasional house guests
  4. 7. The color of night, just a toss away
  5. 8. Twyla's dirty little secret
  6. 11. Place of learning we attend together