Cryptic crossword

ACROSS

1. Backup in Arctic or Antarctic region is liked by many folk (7) 5. Something put down pit does get turned out (7)

9. Colonel joins alliance with somebody one works with (9) 10. Make a bid for iron (chemical compound) (5)

11. Sororial style, Sir, is different (8)

12. 60-minute university qualification (6)

14. I am there in black and white and firmly stamped (9)

16. Doing wrong, it runs wild down under (5)

17. Apply colour quietly: isn’t that ungrammatical? (5)

19. Timely appearance of pope to run out (9)

21. Man in white coat not involved with NTD in 14 Down (6) 22. Neglected chance of making us sad: pep provided instead (6,2)

26. It will gnaw away part of the rod, eventually exposing it (5) 27. Being without resource, won’t move so much (9)

28. How doctor dealt with DT with use of a tree (7)

29. They sit and sun around 1st December in the altogether (7)

DOWN

1. Steps one is put through to show what one can do (5) 2. Hauls one to the top as one stops the car (5,2)

3. Loyal subject for instance can get involved in untruth (5) 4. The ordering of trial gone with u-turn (10)

5. Something done either way up (4)

6. Cattle-food from vendor rep distributed (9)

7. Yellow seasoning sulphur ran off from (7)

8. A trio might seem, to her, awkward (9)

13. Adjustment made to paint a toad a different way (10) 14. Not wise of one politician to have turned to it (9)

15. Throw in a word for jet certain to crash after a loss (9) 18. Burst in on old MP that is out of order (7)

20. Turns red: sun’s making one strip off (7)

23. Placed like a building with vision, one is told (5) 24. Situations one puts in the mail (5)

25. Previous editions showed it not to be new (4)