1. Measure of rank in Maori culture, informally → FACETAT
8. Bubbles → FROTH
13. Sauce in Italian-American cuisine → MARINARA
14. Knocked out → INAWE
15. It's in right now → LATESTFAD
16. Was worthy of → RATED
17. Having a single purpose → ADHOC
18. Light that goes up when things are going down? → FLARE
20. Snatch → BAG
21. Crank cases? → UFOLOGY
23. Something pulled in many car chase scenes, for short → EBRAKE
25. Home to the Arco di Constantino → ROMA
26. Present a chance to get ahead → OPENDOORS
29. Spaniards roll them → ARS
30. Was really moving, in slang → HAULEDASS
31. "Uh ... I guess" → WELLSORTA
32. Sources of 24/7 support → HELPLINES
33. Many an attachment → PDF
36. Ones catching waves → RADIOSETS
37. Longtime name in Cuban politics → RAUL
38. Those playing the king of Egypt in "Aïda" → BASSOS
39. Monthly magazine that sponsors a large annual music festival in New Orleans → ESSENCE
41. Easily removed locks → WIG
42. Limited assignment → STINT
45. Smallest member of the eurozone (122 square miles) → MALTA
46. Appropriately change course → ADAPT
48. Spirals out of control? → TORNADOES
50. Panhellenic Games venue → NEMEA
51. Can't cool off → STAYSMAD
52. Gifted → ADEPT
53. Culinary concurrence → YESCHEF