A bit of everything

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Across
  1. 4. Talent, skill or proficiency
  2. 5. Ocean grass
  3. 6. Tall yellow seeded flower
  4. 8. A group of loose-leafed cultivar, _______ Greens
  5. 9. Man of war
  6. 10. Extra-terrestrials
  7. 13. To negotiate a sale price
  8. 16. Inland arid area (Australian)
  9. 17. Spitural leader of a Mosque
  10. 19. A type of firearm
  11. 20. The wolf of the Plains
Down
  1. 1. Presidential jumbo-jet (3,5,3)
  2. 2. Driving students
  3. 3. A sticky malleable fluid
  4. 7. Ocean predators
  5. 11. 5-tackle-sets Rugby
  6. 12. A Brown-noser of high ranking officials
  7. 14. Small battery (1,1,1)
  8. 15. To take a risk
  9. 18. Refined from a coal-seam (1,1,1)