I looked at 1-Down, [Word before top or party], six letters, and filled in POOPER. Took me few seconds to realize that POOPER TOP 1.) wouldn't pass the breakfast test, 2.) isn't a real thing, and 3.) is a funny phrase evoking images of double-story outhouses that I'll be using more frequently. Talk about COMIC RELIEF!
Onto the puzzle! Four famous comedians hiding at the front of phrases, Sid CAESAR, Eddie MURPHY, Billy CRYSTAL, and Chris POOPER TOP. Er, ROCK. I couldn't personally identify Sid Caesar out of a lineup of him plus four Lilliputian Taiwanese orcs, but the name is quite familiar. And I like how he helps spread the puzzle's appeal to the older generation who might not recognize (or choose to ignore) the more recent guys.

It would have been great to get a more recent comedian, and a female one or two, but who else would fit this theme pattern? If only there were such a thing as a CK AIRPLANE or a CHAPPELLE BERET or a CHO MAMA.
Hey, CK ONE! That "a thing," isn't it?
Really nice gridwork today, Susie producing a smooth solve. All throughout I was impressed at how little glue I encountered, only hitching at the ELD / ENE area. OLD / ONE would be so much better! But OLD HAT sits up at the top of the grid. Ooh, I hate when that happens!
And I really liked the way Susie worked in so much Scrabbly goodness. Sometimes I feel like Xs and Js are jammed in with a big shoehorn and hammer, but I love the smoothness around the J and X in the NW, and the selection of Vs in the SE. I can imagine the temptation to try to squeeze a Q in the SE, resulting in EQUI or something. Vs aren't as spicy as Qs or Xs, but they still do the job of adding seasoning to the puzzle.
You know what was funny for me? The use of the question mark in the clue for COMIC RELIEF. Just when I thought I knew when it should be deployed. I mean, those comedians do provide COMIC RELIEF, yeah?
Overall, a very well-executed puzzle causing me to amuse myself to no end.