Today’s Saturday Stumper

Today’s Newsday  Saturday Stumper, by Steve Mossberg, is a tough one. 16-A, four letters, “Done quickly?” No, not at all, in large part because of 16-A. (No spoilers: I explain in the comments.)

Some clue-and-answer pairs of note:

5-D, three letters, “Elvis played it between tour stops.”Suprising, not surprising.

13-D, nine letters, “Question before the cameras.” Fun.

17-A, ten letters, “Going over everything.” I kept thinking the answer must be a participle.

19-A, four letters, “Bug out.” I didn’t know it, so I hereby deem it arcane.

26-D, ten letters, “Comparatively slick.” C'mon man. This is pretty ridic.

33-A, fifteen letters, “Star Trek intro claim to fame.” My starting point. A giveaway, I think.

39-A, seven letters, “Party central of a sort.” Ugh.

52-D, three letters, “Some PJs.” Seems ridiculously arbitrary. “Some almost anything” would work as well.

55-A, ten letters, “Rolls in it.” I wanted LUXURIATES.

My favorite in this puzzle: 30-A, four letters, “Slimmed-down food department.” Now that’s one clever clue.

No spoilers; the answers are in the comments. But if you know what Elvis played, you might agree that everyone should play.