Complete
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1 9 11 15 17 21 25 2 12 3 13 20 24 26 4 18 5 16 19 14 8 10 22 6 23 7
  1. 1 a Key used to delete the previous letter (9)
  2. 8 a Flaming __ , Frederic Leighton's 1895 painting (4)
  3. 9 a Promote (9)
  4. 10 a Therefore (4)
  5. 13 a Unemotional person (5)
  6. 15 a Formula for making something (6)
  7. 16 a Kind of incentive? (6)
  8. 17 a Flat bread eaten at Passover (6)
  9. 19 a Shuffling of a pack of cards (6)
  10. 20 a Degree — grade (5)
  11. 21 a River running from the North Pennines to the North Sea (4)
  12. 24 a Stew (9)
  13. 25 a Clare Smyth or Heston Blumenthal? (4)
  14. 26 a Tiresomely, over and over again (2,7)
  15. 2 d Acquired immune deficiency syndrome (4)
  16. 3 d German Baltic city, host each year to the world's largest sailing event (4)
  17. 4 d Little (6)
  18. 5 d Inconceivably big (6)
  19. 6 d Skills needed to survive in a natural environment (9)
  20. 7 d Single-room accommodation (9)
  21. 11 d Cooked fowl's lower joint (9)
  22. 12 d Widely distributed (9)
  23. 13 d What things are wound around (5)
  24. 14 d Raise trivial objections (5)
  25. 18 d Foreshadow (6)
  26. 19 d Body of water that Moses parted when leading the Israelites from Egypt to the Promised Land (3,3)
  27. 22 d Guns (to be borne?) (4)
  28. 23 d Kind of circus performer? (4)

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