85.

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Across
  1. 1. A ride through the countryside on horseback; a board on which a hawk's meat is laid by a falconer; o
  2. 4. Takes your seat from under you where Sir goes on horseback to play knights (6)
  3. 9. Go on horseback astride good saddle (5)
  4. 11. "I ____ my rival, but only to strangle him" (Nero, in Jean Racine's Britannicus)
  5. 12. UP Arrive on horseback
  6. 13. Going in jeans, then? Not oddly something a bride will put on (8)
  7. 18. Father goes on horseback ___ heathenish! (5)
  8. 20. Go across Turkey ___ on horseback, it seems? (8)
  9. 21. A holy man goes on horseback or walks
  10. 23. Game to go on horseback, if a little apologetically (4)
Down
  1. 2. You"ll need a good man to go on horseback ___ like this (7)
  2. 3. Angels-on-horseback item
  3. 5. Angel on horseback
  4. 6. Walk short way then go on horseback (6)
  5. 7. Go on horseback
  6. 8. Make fun of French having to go on horseback (6)
  7. 10. Big name in 1980s jeans
  8. 14. Designer jeans brand big in the 1980s
  9. 15. Offshoot of Marxist-Leninist ideology featured in Jean-Luc Godard's "La Chinoise"
  10. 16. OF The first in Jean Auel's Earth's Children series, The ... The Cave Bear (4,2)
  11. 17. They go on horseback
  12. 19. Go on horseback astride good saddle (5)
  13. 21. First of riders on horseback goes on to rouse his supporter?
  14. 22. Went on horseback with nothing on in a wild show