ACROSS
1. Go away
4. Planned major port on the Pacific coast
6. Overreactive
9. 1940s escape routes from Europe
10. NEXT, for example
11. Olympiad champion
12. Vow
14. A Scottish Monday
16. Pinnacle
19. Someone from Dallas, for example
22. Something worth reporting
24. Canton legislatures
26. Out of perfectly thin air
29. Matt Hawk
30. A psychological manipulation
31. King with donkey ears
32. An antelope
33. Fibers
DOWN
1. 1950s sex symbol
2. 1940s-'50s British politico
3. Extensions from the body
4. Taking land elsewhere: Br.
5. Middle-aged or older
6. Modem instructions
7. Raffle
8. Despondent
13. Teddy bear, for example
15. Milled
17. Fools
18. A Swiss theologian
20. Someone at a conference, for example
21. A device for holding a flask
23. A fluke, for example
25. Japanese drinks
27. More recent
28. Teacakes
Apology and clarification:
I realized only now (meaning at this writing, which is some time after posting the puzzle) that the answer to 1 down is spelled wrong. You should probably ignore 1 down when solving the puzzle (though you should be able to fill it in with its spelling mistake at some point in your solving). I apologize.
Hints, added after the original puzzle posting:
As hints, I present easier (some of them much easier) versions of some of the clues above. Each is hidden separately so that your solving the puzzle need not be spoiled more than you wish it to be.
1 across4 acrossGo away!
10 acrossPlanned major port on the Pacific coast of Mexico
12 acrossNEXIS or NEXT, for example
14 acrossTo vow
24 acrossA Scottish Monday in January
30 acrossSome cantons' legislatures
1 downAn attempt to win people over by alarming them
4 downActress, a 1950s sex symbol
6 downTaking and populating a distant land: British English
7 downHayes modem instructions
15 downA raffle
17 downMilled an old-fashioned way
18 downFools or dolts
21 downA 20th-century Swiss theologian
23 downA device for holding a flask or beaker
25 downA parasitic fluke, for example
28 downSome Japanese drinks
Some teacakes
More hints, added even later:
Here's the grid with twenty answer letters added here and there: