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. 1a Rule or standard of proper behaviour (9)
  2. 8a (Of a person) extremely dependable (2-2)
  3. 9a Massacre (9)
  4. 10a Sure thing (abbr) (4)
  5. 13a Mate (5)
  6. 15a Persist (4,2)
  7. 16a Restrain with a rope (6)
  8. 17a Motivated (6)
  9. 19a Remorseful feeling (6)
  10. 20a Williams or Atkinson? (5)
  11. 21a Layer of ore between layers of rock (4)
  12. 24a Chicory with purple leaves — a CID choir (anag) (9)
  13. 25a Rat, human or boat? (4)
  14. 26a Rembrandt or Van Eyck, for instance (or one of their works) (3,6)
  15. 2d Small brook (4)
  16. 3d Fluorescent lighting (4)
  17. 4d Natural (6)
  18. 5d Hidden (6)
  19. 6d Getting here is a sign of progress (9)
  20. 7d All future generations (9)
  21. 11d They start in freefall (9)
  22. 12d Discuss old times — I'm sincere (anag) (9)
  23. 13d Screen (5)
  24. 14d Country at the southern end of the Arabian Peninsula (5)
  25. 18d Bowler's illegal delivery (2,4)
  26. 19d Intensely radioactive element found in uranium ores, Ra (6)
  27. 22d Having them all, puts one in control (4)
  28. 23d Pipe used to transport liquids or gases (4)