The revealer says it all. 63A: Entranced ... or what one can do by reading the starts of [the theme answers] (SPELLBOUND). Each of the other answers starts with a phonetic representation of the letters spelling "bound," in order from the top to the bottom. That's a lot of constraint! All of the answers are strong, although I note that DECAFLATTE is the only one where the syllable phonetically representing the letter in question is not its own word. I suspect that would be a major challenge.
Meanwhile, there are some fun answers in the fill. INNOUT, BYENOW, and NULLIFY are nice mid-length answers. WOOLGATHER is evocative, even if we mostly hear it in its inverse form, "gathering wool."
1A: Kids and their parents (GOATS). Yup.
6A: Help with a job, in a way (ABET) - didn't fool me for a second.
10A: Wanted, but nowhere to be found (AWOL). That's the first three across clues, by the way.
I enjoyed this puzzle a lot, even if it took me a good deal longer than my average Tuesday time.
Congratulations, Mr. Allen!