1.  2.  3.  4.  5. g 6.  7.  
  g   g   g   g   g   g   g
8.    g 9.          
  g   g   g   g   g g g   g
10.          g 11.    
  g   g   g   g   g   g   g
12. 13.  14.  15.  16.  17.  18.  19.
g   g   g   g   g   g   g  
20.     g 21.         
g   g g g   g   g   g   g  
22.   23.        g 24.   
g   g   g   g   g   g   g  
25.     g 26.         

ACROSS

1. Nasty itch ... rough place with 12 Across concerns (4,5)

6. Partial exemption for rough shelter (4)

8. Greek letter in the tar ... holistic hip-hop sign (3)

9. New historians at a loss for ancient Christians (10)

10. Bad mood consumed cool (9)

11. Pitch four balls at 12 Across (4)

12. ? (14)

20. Post-apocalyptic organ control? (4)

21. Finest rum mingled with cola extract creating rhythmic music (9)

22. Silly Nine get rid of 3 Down (10)

24. Greek letter damaged ... take some tea (3)

25. Second hand leather trimmed and reworked (4)

26. Rebels regarding family members (9)

DOWN

1. In there tickling deviant (7)

2. Beneficial person, a clarinet player (7)

3. Happy with 12 Across nature (7)

4. High street art smart alec (7)

5. It's out of circulation, as rewrit, wont, etc. (3,4)

6. Greek letter in the tar ... holistic hip-hop sign (3)

7. Transporter sick on a bean (7)

11. Band in magazine? (3)

13. 12 Across's perhaps, or personal exposings (7)

14. Greek letter damaged ... take some tea (3)

15. Pains I'd erst forgotten ... exposing member (7)

16. Casts run about on fish (7)

17. Captives in partners? (7)

18. Venetian bashed and robbed of innocence (7)

19. Some clergy ... the French MS tycoon! (7)

23. Stick to fish (3)