Easy Cryptic

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Across
  1. 2. Gunman Ray messily finds singer (4,5)
  2. 4. Boy after 1707 waving flag (5,4)
  3. 6. Exclamation after river spawns bear (4)
  4. 7. Conscientious man following Asian capital (8)
  5. 8. Flower that says "meow"? Not unlikely (5)
  6. 10. Official leader at end of the earth for racing driver (5)
  7. 11. Left on ship hospital for beer (6)
  8. 12. Left terrorist group for money (4)
  9. 14. Dog in quartet, perhaps (5)
  10. 16. Abseil dangerously with manager (6)
  11. 17. Superhero with swag? All in white (7)
  12. 19. Posh Richard cut keys (10)
  13. 20. Handsome cable inside PM at National Gallery (9)
Down
  1. 1. "Here, sweetheart" with weight (10)
  2. 3. Mum's favourite holiday destination? (7)
  3. 5. Touring Greece clumsily detects radiation (6,7)
  4. 6. Long for ice cream eaten by squirrels (8)
  5. 9. A granma angry at mix-up (7)
  6. 13. Endless farewell after cigarette for cat (5)
  7. 15. Greek letter intentionally erroneous to listen to (5)
  8. 16. Clare losing hair? (7)
  9. 18. Angry term? (9)