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

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