Across

5. 12's young woman is going back and forth at producer price index (11)

7. 12 is right to go in safer movement (6)

8. An intent gaze of saint at the heart of Karen (5)

12. Tear apart restricted waterway (5)

13. Both extremes in brother's 12 (6)

16. Radical alien vessel to come back (6)

17. Get zany, crazy 12 (7)

21. Look at northern Spanish gentleman's city (6)

22. Arrange in layers, provided second formal agreement (non-eastern) goes outside (8)

26. Those who know a lot about a subject have ten for each time caught in Midwest (7)

27. No actor could produce animation (7)

28. Be of importance to business (7)

Down

1. 12-0 at the end of game (4)

2. Animal to offer without right (4)

3. Soldiers went into strange tin to get usually medicated preparation (8)

4. Drink a rising 12 (4)

5. A bit of drama if American returns to secret organization (5)

6. Someone on ice with awful streak (6)

9. The Spanish head of finance at home is mischievous (5)

10. With a bit of luck, I've caught Romeo's old French money (5)

11. Prisoner to proceed to 12 (5)

14. Astonish — mostly on 12 (6)

15. Follow and endorse footballer (8)

18. Damage among 12 people? (6)

19. Unproductive 12 twice in bean stew (6)

20. Sort of paper and its use, perhaps (6)

23. To select without King's subject (5)

24. Country in yonder 12 (5)

25. Valley no good with a 12 (4)

Solution