A 'hex' of a puzzle today. :) The revealer, "Much-covered 1956 Screamin' Jay Hawkins song ... hinting at what happens three times in this puzzle's solution" (IPUTASPELLONYOU) lets us in on the secret: each of the three theme answers contains a HEX. Depending on how you feel about TOOTHEXTRACTION, MATHEXAMs, and CORNCHEX, these may all be the work of evil magicians. :) I was too preoccupied spelling CDE to notice the theme during the solve, although the unusual number of X's did make me wander.
I was charmed by some of the fill, including RATS (excellent as a lamentation, less good instantiated), RETORTS (I am always wishing I had better ones), and TACHYON, which sounds like magic.
Clues and answers I liked:
Ones making a case for drinking? (SODAS) - FANTAstic. :)
One who talks on the phone a lot (SIRI) - well, I don't actually *like* SIRI, but I liked the clue.
Make more alluring (SEXUP) - OHYES.
Flat sign (TOLET) - it works on two levels
Buffoon (ASS) - ha!
Apt name for a worrier (STU) - APT!
We also have a super natural mini theme with MOOMOO, BAA, ASPS, and ANIMALIA, not to mention the aforementioned ASS and RATS.
TOME, the clue "Lump on a trunk" (BURL) was less than enchanting.
Well, that's all for today. I've got a lot voodoo.