Cryptic crossword No 3,568

Across

1. See 1a
2. Ultimately wife (Henri’s) scratching head after getting distinction (8)
3. Hot Japanese artist by sunrise regularly records royal announcements (7,5)
4. Lives next to airport, as convenient primarily, in Hayes? (5)
5. Contemplate papers etc covering list's finishing touch - STEM, essentially (8)
6. Cooked fresh lobster thermidor from time to time, hence initially loud beep around former 17d (6,2,3,4,9,5,2,3,7,6)
7. See 1a
8. See 1a
9. See 1a
10. Genius’s flatmate with a case of tendonitis, running (6)
11. They’re entitled to go interrupting high fliers (4,5)
12. Doctor consulting rota, a nice one! (15)

Down

1. Dainty, fine work on ship damaged (7)
2. Maybe Reno judge presides over each termination of union (4)
3. Most popular character in The Beatles really restricted on record (4)
4. Not clued (3)
5. Two entertaining king and principally queen of Arab country (5)
6. Not even Democratic Party showing up (3)
7. Sail ocean heading north carrying bacteria (1,4)
8. Drove from one end of Holland on ecstasy (5)
9. Call from better - occasionally best - phone equipment (7)
10. Wrong against right (4)
11. A certain revolutionary Brian (3)
12. United Fuels working to be competent (6)
13. Zero in on cold metal (4)
14. Increasingly pleasant French city close to water (5)
15. Some butter in soup, a teaspoonful (3)
16. Me and 28d 21a 17d, for example, taking time for some poetry (7)
17. Petitions fool to welcome knight (4)
18. Woman from north-east England’s lovely, disregarding limits (3)
19. Computers brought up too much information about European birds (7)
20. Bump into Margaret on vacation around eastern Spain (4)
21. Coat of arms originally seen in Monaco (3)
22. Swimmer’s extremely enjoyable length (3)
23. Initially absent, lad takes in part of speech just there (6)