Complete
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6 7 10 13 17 21 23 1 14 2 12 11 3 16 22 15 4 8 20 18 5 19 9
  1. 1a No worries! (2,8)
  2. 7a Shaped to fit (like iron?) (7)
  3. 8a A catcall? (5)
  4. 10a Distort (4)
  5. 11a To do with the major blood vessels (8)
  6. 13a Act as an organised group (4,2)
  7. 15a On time (6)
  8. 17a Tangible symbol of approval (8)
  9. 18a Swear formally to be true (4)
  10. 21a Organ giver? (5)
  11. 22a Dog — in leaps (anag) (7)
  12. 23a Blue-green veined cheese named for the Lombardy town where it came from (10)
  13. 1d Largest extant species of deer (5)
  14. 2d Something that can be turned anew! (4)
  15. 3d Full (6)
  16. 4d Balance — harmony (8)
  17. 5d Acceptance of the facts of life (7)
  18. 6d Pontifical protection? (5,5)
  19. 9d Very extensive (4-2-4)
  20. 12d Large aggressive amphibian (8)
  21. 14d It's impossible! (2,3,2)
  22. 16d American inventor, who had his 'light-bulb moment', d. 1930 (6)
  23. 19d There you are! (5)
  24. 20d Salad dressing (abbr) (4)