4:12 (FWOE - typo)
This is an old standby for themes: two word phrases, each of whose words when combined with a third common word, make new phrases. For it to work, the theme answers must each be recognizable, the new phrases must all be common parlance, and the revealer should be a clever way of explicating the trick.
The last is certainly true here: DOUBLETAKE is nicely doubly used here. The second condition is also well met: "take heart", "take shape", "take cover", "take charge", "take down", "take home", "take back", "take away", "take after", and "take effect" are all well known phrases. The first reminds me of Pirates of Penzance. Actually, at this point, the word "take" has lost all recognition to me.
Unfortunately, I'm not sure the first condition is met. HEARTSHAPE is ad hoc. DOWNHOME and BACKAWAY are acceptable if banal. But AFTEREFFECT feels not a true thing. Googling it brings up an Adobe program primarily. Anyway, others may disagree. It's pretty close to working, in any case.
I'll also pick a little nit with HALFGONE. Or perhaps more with the clue, with a reference to dementia. Perhaps this is not particularly sensitive. It certainly could have been clued with, say, a partially eaten pie, instead.
Otherwise, I give enthusiastic thumbs up to OGDENNASH and SUPERMOM. I've never heard the term SUNDOG before, and I like the learning experience.
1A: Tease good-naturedly (JOSH) gets a B-, a slight bump in grade being achieved due to the difficulty of figuring out which 4-letter J-word is being referred to. In fact, my first confident answer was JIHAD. My error came at the cross of EPEES and TOSS, where I'd typoed a Z instead of the S, but my eyes had already moved on. This is really a mistake borne of iPad. It would never have happened either with a pencil or an analog keyboard. But them's the breaks.