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