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

ACROSS

1. Head one secures by order of angels. (14)

8. Bans device which supports drinkers. (8)

9. Can such a Mulla be Omani, showing a return of independent cell? (6)

11. Lock the University! (4)

12. From within, it's a sign: I'll do on a camp bed (returning, forgetting my failing heart) what I did when I was young! (10)

14. Mean assembly type. (6)

15. Confused, lost it? Inherit locally-named river. (5)

17. Acid-taker, not very quiet, he's very persistent. (5)

18. Give Kelly ten inches and she'll give back much more. (6)

20. Green is mixed with gin and tonic. (10)

21. Naughty boy misses points of (19-Down). (4)

23. Arranges decorations (& cuts to ice). (6)

24. Second to measure of alkalinity, holding bat is most important for developing photographs. (4,4)

25. Measure donger ... is Hiphop leader (before Backstreet Boys that have grown up) giving exaggerations perhaps? (14)

DOWN

2. Not often sign of a chemical to depend on. (6)

3. NBA? (4)

4. So, I replace an extreme nationalist. (12)

5. Excessive sacrifice, losing line to the masculine German. (10)

6. Individually considered and arranged die-times. (8)

7. Using vernacular in good correspondence argument. (8,5)

8. Intolerably white? (6,3,4)

10. Precious grass released by Mme Hooch and taken orally by young Harry. (6,6)

13. Derivative of derivative of Switch - right in ale, without "the" ingredients. (10)

16. Smoke hangs over bad car possibly used by terrorists. (4,4)

19. Animal hugs Ron's head to bosom. (6)

22. Later, part of a native American home featured a sword. (4)