A DEVIOUS, or "D - V - ous," set of theme answers today, all two words, the first starting with D, the second with V. If I had taken the time to understand this while solving, I might not have had so much trouble figuring out DEMOVERSION (59A: Prototype, maybe). I think I had "Pond" for 57D: Common fishing spot (PIER), and for some reason I had "SAVEsUP" for 40D: Put some money away (SAVEDUP), so sEMOVERSoON did not look very good. And another thing that slowed me down was guessing "DacapO" for 53A: From the beginning: Lat. (DENOVO). I would argue that DENOVO means "anew," whereas "da capo" means "from the top," or "again." It's a small distinction, and one that I probably wouldn't argue too strongly. Ah well... it all got sorted out eventually. And in the end, I enjoyed the theme, especially the amusing revealer.
The conversational SAYWHEN (13D: Pourer's instruction), ILLBITE (11D: "O.K., tell me more"), and especially NOCANDO (3D: "Sorry, Charlie!"), and the slangy RAD, DOPE, GAG, and ADORBS (49D: Cute, in modern slang), give the puzzle a nice contemporary feel. And then we have a few uncommon, interesting words like BLEAR (65A: Dim with tears) and MUM (66A: Closemouthed) to balance it all out.
Overall, I enjoyed it.