Cryptic crossword No 3,561

Across

1. Married idiot beginning to effectively utilize rubber (8)
2. Natural environments British half-returned around globe (6)
3. Carved stone found in wasteland (5)
4. See 26a
5. Terrible grief overwhelming terrible smell of old weapon (9)
6. What makes nails age and change after conclusion of housework? (7)
7. Chelsea's back with three points again (4)
8. Youngster mostly liberal and cool (5)
9. A conservative mind, occasionally bitter (4)
10. One who nets most beats my offering essentially...there's one hiding in each row (3,6)
11. Blast radius evacuated, outside beginning to appear tense (4)
12. Charles initially working through test of the crown (7)
13. In extremes of disarray, stranger is unstable (7)
14. Rise in influence (7)
15. Forlorn and irritable, taking off clothes and hats (9)
16. Sailor going round dance switching hands with confidence (6)
17. Pacified goon eating greens with daughter (8)
18. Blockade is forced back - superiority died away (5)

Down

1. Base skills taught about love leading to mishap (5)
2. Sustains store with drink (5,2)
3. On edge, German is miserable (4)
4. Turned on the radio for exercise (5)
5. Marine creature identified when covered in saline mixture (8)
6. Desire for sex with companion (4)
7. Motorists cutting distance creating sensation (7)
8. One tapped on shoulder is upset by rudeness at first (3)
9. One's tight clothing is with yours truly before run (5)
10. Protection from female leaving herself misguided about Tesla (7)
11. Chopper flying north, heading for mechanical check-up (4)
12. Bag clasps on sides switched (7)
13. Did mass production's introduction upset food store? (5)
14. Party with Japanese bread specialist (5)
15. See 31d
16. Delivered an opening to cherish (5)
17. Leader from church providing energy within (5)
18. A dash of advocaat, cooked with cream and then left becomes sweet (7)
19. Where can groceries be found without a man? (4)
20. Support space when cycling? Not on these! (7)