Oren's Cryptic #2

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Across
  1. 3. Sword killing advice to a ninja: attack heads (6)
  2. 4. After what Moses did to that sea, why celebrate? (5)
  3. 9. Right. So be it. It can be instant (5)
  4. 13. Cap cocaine if abuse extends from Alaska to Antarctica (7, 5)
  5. 15. Pop band known as MI6 after offing Arabian chiefs (5)
  6. 16. Genius employer damaged appliances when removing sides (5, 3)
  7. 17. Utterly free of punctures? That's diabolical (6)
  8. 18. Anaesthetic amount (6)
  9. 19. Time this singer is sent as a "roll" (5)
Down
  1. 1. Tall, fast, wild kind of playa (4, 4)
  2. 2. Sarah A. goes crazy for Chad's yellow top (6)
  3. 4. Every child is a unique individual (6)
  4. 5. I'm Spanish and it means the world to me (5)
  5. 6. Add sugar, spice, and everything nice. To finish, scoop out mud, garbage and seaweed (6)
  6. 7. Under-par hole is less likely at first for steeply angled ground (6)
  7. 8. Cameron will briefly sound like an even-toed ungulate (5)
  8. 10. "Twisted dry", am I? That means a lot (6)
  9. 11. Perverted as runt who devoured his son (6)
  10. 12. Dingy outside clothes ain't delicate (6)
  11. 14. Old-timer is opposed to that Brazilian (7)