Helderberg

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Across
  1. 5. renowned Australian soprano (5)
  2. 6. Cue sport (7)
  3. 7. Queen in a Midsummer Night's Dream (7)
  4. 10. Every schoolchild needs (6)
  5. 11. Support (7)
  6. 13. At one (6)
  7. 16. Hosiery (9)
  8. 17. Stroll (5)
  9. 19. Relating to the body (9)
  10. 23. Sideboard (7)
  11. 24. Stubborn (9)
  12. 27. 217 day siege (8)
  13. 28. Emperor of Japan (8)
  14. 30. Help (6)
Down
  1. 1. Largest river in Rhodesia (7)
  2. 2. Open grassland (4)
  3. 3. Astonishment (8)
  4. 4. Lifts balloon (3,3)
  5. 6. Spiritualist's meeting (6)
  6. 8. Dwelling (5)
  7. 9. Dexterity (7)
  8. 10. Unfashionable (5)
  9. 12. Guidelines (5)
  10. 14. Forbidden (5)
  11. 15. Biblical departure (6)
  12. 18. Captain for the 1947 Tour of England (8)
  13. 20. Greek counterpart of Venus (9)
  14. 21. Accept reluctantly (9)
  15. 22. Capital of Portugal (6)
  16. 25. Joust (4)
  17. 26. Alternate name for Judas son of James (9)
  18. 29. Just (5)