Cryptic crossword No 3,711

Across

1. Okay, ending early means it's over (3)
2. Cooking dinner, a vocaloid artist (8,2,5)
3. Professor Lars consumes bacon bits (7)
4. Chart topper to make a penny (3)
5. Missouri birds - they're native to America (7)
6. First person that's said yes (3)
7. Hot and cold machine for shock therapy? (4,11)
8. In English, the sure thing (8,7)
9. Alternatingly itchy and cold (3)
10. Returned letters from Parisian teacher's address (3)
11. Superiority of supermodel, it is mostly from within (7)
12. Duck, one half, zero, two? (3)
13. Set loose, I am the orc, the orc of many colours! (15)

Down

1. Murder headless and leather-clad clown (8)
2. Resits when failing to be paired up? (6)
3. Daddy's back, sucker! (3)
4. Not to get jailed in pen and bunged up! (6)
5. Detective Wan, stop! (8)
6. One of the ivories, perhaps, or a set of them? (3)
7. Time to regret being honest (4)
8. Dorian gets painted anew, leading to break-in (6)
9. New order to command caution, Germany's vanguard is giving no quarter? (15)
10. Pigeon's noise is revolting activity when heard (3)
11. Levy no charge, having no right (3)
12. Check suit? (4)
13. What separates definition after getting reformulated (15)
14. A breast covering - crucially modest to wear (6)
15. Plant inspector chides upon inspection (6)
16. Turn me over after stubbing toes! (4)
17. Measure how much of manner's made by man, perhaps? (4)
18. Greek underworld bearing souls at first, some returned thence? (6)