Across:
   1. Endorse lunatic, veto a cad (8)
   5. Adjustment to defective television (6)
  10,26dn. Service with annual salary via Tory establishment (5 10 4)
  11. Going AWOL with war horse, call out kings (7)
  12. Sovereign OK, emperor not entirely back with the flow (6)
  13. Silly wager about one's grub (6)
  14. Small measure of torment with memory that can't be erased (8)
  17,14dn. How 1 down delivered aria, performing after six (3 3)
  18. Pour out problems with doctor, having taken psychedelic (an 'E' etc.) (8)
  20. She's often said to be in distress, but coming back calmer after a second expulsion (6)
  23. see 6 down
  25. Singing top part at opera... no missing first note! (7)
  27. Coming around about one getting fancy car; performance mostly far cry ahead of Aussie industry leaders, but such a big vehicle needs a lot of coming around! (8 7)
  28. Sings high and low, composing sly ode (6)
  29. Term, or several terms, leading up to a full stop (8)
Down:
   1. A pointy bit (9)
   2. Destroyer 3 with 16 sank one venturing far (7)
   3. Impact of silicon revolution overwhelmed most elderly (9)
   4. March third King finally correct about (6)
   6,23ac. Venturing far, even sank destroyer of US 26 (5 1 5)
   7. Top bowler who comes up with a good line? (7)
   8. Combat vehicle which keeps getting flooded (4)
   9. Brings alive, returned, freed from end of life, with strength to go on (7)
  14. see 17 across
  15. Rum 26 exercise in 1969? (3 6)
  16. Criminal mob rule quarter of city (9)
  17. Oversimplify, ignoring origin and odd limp, to make into ode (7)
  19. Declare deviant not given a 29 (7)
  21. Sat in to sabotage position (7)
  22. Mind being somewhat tipsy & cheeky? (6)
  24. May be behind it, but march in front! (5)
  26. see 10 across