17

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Across
  1. 6. - Photography device (6 letters)
  2. 7. - Red-breasted bird (5 letters)
  3. 8. - Space explorer (9 letters)
  4. 9. - Explosive displays (9 letters)
  5. 11. - Type of tree (5 letters)
  6. 14. - David ___, musician (5 letters)
  7. 16. - Fruit with a core (5 letters)
  8. 18. - Festive celebration (8 letters)
  9. 19. - One-cent coin (5 letters)
Down
  1. 1. - Long-distance running race (8 letters)
  2. 2. - Pungent vegetable (5 letters)
  3. 3. - Dwarf planet (5 letters)
  4. 4. - Striped big cat (5 letters)
  5. 5. - Precious gemstone (7 letters)
  6. 6. - Timekeeping device (5 letters)
  7. 10. - Slow-moving gastropod (5 letters)
  8. 12. - Pollinating insect (8 letters)
  9. 13. - Tree-dwelling primate (6 letters)
  10. 15. - Massive system of stars (6 letters)
  11. 17. - Musical instrument with keys (5 letters)