I couldn’t help myself, I just had to make up another “Bad tempered oath (9)”

As usual, there are a few Whoey clues and/or answers mixed in with the less Doctorly ones.

Across 7. See 12 8. Insectoid buzzin’ but no “hi” (5) 10. Time Lord, perhaps the Doctor? (3,5) 11. Short logician in mature occupation – of Steed, perhaps? (6) 12, 7. Swirly time hid swirly bus driver and possible Time Lady (4,9) 13. Sign ran back to kill polymath (8) 15. Sort of crisis for health care professional when primary welfare is left out and left in (7) 17. Feelings shown by half-smirks and falsehoods (7) 20. 32 below freezing in the US, shirt and newspaper necessary on many occasions (8) 22. Obligation, may involve interest (4) 25. 23 players dubious and disdainful (6) 26. Notorious Italian city almost within ring, almost (8) 27. Race in the manner of a crib (5) 28. Sir loses head, wears dress – at 18? (9)

Down 1. Place in toilets for comedian and actor (5) 2. Thing back in, was on horseback – correct me if I’m wrong (6) 3, 18. Murder mystery from 14, or sound of sapphire waterfall? (6,2,8) 4. Beryl – aunt and ‘arbinger (7) 5. Add extra large 5 for Gerry-built spaceship (8) 6. Overheard plan to imprison a ruminant aboard ship – he’s not quite general (9) 9. Friend of 16, owned joint in the past (4) 14. Story lovers use mature protection (3,6) 16. Friend of 9 with lo-calorie appendage (8) 18. See 3 19. Advanced type of paper, almost like Robin (7) 21. Can first Mesoamerican culture (4) 23. Game found after 6 and mostly mythological river, and before New Zealand island (6) 24. Legal judgement from noted airline (5)