Simply Complicated

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Across
  1. 4. Swift acquisition from Shamrock
  2. 5. Over which Lynch gets literal
  3. 6. Stony-faced in the gutter
  4. 8. Dull subject for Thom van Dooren
  5. 11. Eastern realm often mistaken for southern land
  6. 14. DHL versus FedEx
  7. 15. Come again
  8. 16. Like Dürer or a jigsaw
  9. 17. One of a cohort for which Freddie Mercury has no time
  10. 18. Sambuca pro espresso
Down
  1. 1. Novelist, playwright, top-tier hater, and clue to all answers in this puzzle
  2. 2. Describes a tree trunk
  3. 3. Whose uncle goes on about family resemblances
  4. 7. Adam
  5. 9. In spite of his name, enlightenment figure managed quite a bit
  6. 10. Whose Prelude and Fugue is out of this world
  7. 12. The CPSU until independence in 1990
  8. 13. What’s the matter, XXIV?