Cryptic crossword No 3,714

Across

1. In reverse of homoousianism (sin!), air alternative heretical creed (8)
2. Female nags, dropping second note for 24 of 18 across (4)
3. After wiping top of bench, I tossed salad for something to eat (10)
4. Mixture of mud and air, dangerous stuff (6)
5. Having scored this type of goal, now worse off? (3)
6. Special lubricants for 8 (6)
7. Survives end of life, becoming a great figure in literature (6)
8. How a rival is cut down? (3)
9. She let out bottled up troubles, with one or two extremes of paranoia (7)
10. Heard rumours helped by this? (7)
11. It settles on surface and rakes middle half (6)
12. From the east, man's best friend is a wise old fellow? (3)
13. Afterthought about tramp and 25 of 8 (6)
14. Uncle Bill's heart turned, a measure of relative power (3)
15. They provide computers as tool; I vet times so live TT information conveyed twice (8)
16. Rank donkeys beginning to smell (6)
17. Go against new English leaders after aristocrat getting rid of union party (10)
18. Female nags, losing head for 24 of 18 across (4)

Down

1. No end of joy in Hindu 28 as in 1976 they sent 5 21 (25 and 26) to 8 (4)
2. Hardened, giving up sixth of treats as 24 (so brought up) (8)
3. One participating in protests for 25 of 8 (6)
4. Region 21: CIA-wrecked area (7)
5. Naval warrior the sixth ruler (6)
6. They may serve drinks, which on 8 are sweet products (4)
7. Square of polynomial lies above? Zero at roots! (5)
8. Hirsute, naked spirit (3)
9. Stink about sequence of shows for popular musical 8 (5)
10. Funny fellow losing first bit of 32 (3)
11. In report, studied the sort of 29 down they call 8 (3)
12. "Uno" (Neapolitan) conveys this? (3)
13. Spirits lifted for example when accepting onset of disaster when disaster has to happen (8)
14. One that circles, or one that nips? (7)
15. Marks scored by golfer by bringing up saint and ancient poet (6)
16. Special procedure as trial modified to accommodate university (6)
17. Scheme: Elon's Tesla heads for 8?! (6)
18. Going up? Implement 13! (4)
19. Sending up favourites one part of scheme? (4)
20. Attractive part of game mostly turning on midcourt obstruction (6)