Solve the Clues, Find the Answer

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Across
  1. 4. Deadly sin of lions? (5)
  2. 5. Crazed Muppet drummer (6)
  3. 8. Try to locate or discover (6)
  4. 12. Basic Components (8)
  5. 14. April 5th (8)
  6. 16. Silver went after gold in this island (8)
  7. 18. Opposite of out (2)
  8. 19. Find out why - I approached the entrance wearing undergarment (11)
  9. 20. The King (5)
  10. 21. The side that is forward or prominent (5)
Down
  1. 1. Banjo's cousin (6)
  2. 2. Haggle for a cheap purchase (7)
  3. 3. Reflects what is deceptive with smoke (7)
  4. 6. Superpower sources, maybe (6)
  5. 7. A land mass that projects well above its surroundings (8)
  6. 9. Mark a birthday (9)
  7. 10. A machine for performing calculations automatically (8)
  8. 11. Search for prey (4)
  9. 13. Tidal mouth of a river (7)
  10. 15. Private road; impel (5)
  11. 17. Stashed Away (6)