Science No. 2 — cryptic crossword

A themed (Science) standard puzzle: 28 clues on a 11×11 grid. Solve it online — check your answers as you go, ask for a hint, and read how each clue works once it is solved.

Across

1. Marks from a broken stick (5)
4. Judge troubled by US ad is a traitor (5)
7. Home deliveries partly by sea (3)
8. Not hale after messing with spirit (7)
10. Panes shattered by a tree (5)
12. Listener by the lake, a peer (4)
13. Creature that we hear is naked (4)
14. German car with nothing for sound (5)
15. A male cat, or the smallest particle (4)
17. Merely the leaders of Oslo, Newcastle, London and York (4)
19. No gem, sadly, but a garden figure (5)
21. Experience a unit of work forced into reverse (7)
22. Check out the animal doctor (3)
23. Layer cooked ahead of time (5)
24. Hesitation cutting into the total, a blood product (5)

Down

1. Mature Peter developed a fever (11)
2. Editor packed in car, a source of timber (5)
3. Tame animals brought up a stair (4)
4. Gospel writer in the smallest room (4)
5. Lair to the south-east is impenetrable (5)
6. Planets and their star make a sun-powered network (5,6)
9. Looking after, but carelessly denting (7)
11. Alms given out with a bang (4)
13. Bosses of big oil often mention growth (4)
16. Decoration for a religious community (5)
18. Verne novel? Not on your life! (5)
19. Good about an unknown horse (4)
20. Circles losing their leader? Silly me! (4)

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