15 across: Spooner’s body art forged by 18-down (Simpsons) villain (3, 4)
I’m almost certain that when I get an explanation for this it will end up in the DA Gold section. Alas, all I’ve got is Simpsons villain = Fat Tony.
18 down: The likes of 2-down (Bart) captured by the likes of 2-down (Bart), by 10 & 26-across (Matt Groening) (8)
The answer here is Simpsons, but that could just as easily be because the likes of Bart = Simpsons as much as it could be because by Matt Groening = Simpsons.
14 across: Mostly tense drama, eclipsed medic show of 26-across (Matt Groening) (8)
Here, show of Matt Groening = Futurama, but other than the rama being a sizeable portion of drama, I can’t work the rest out.
3 down: (Bart) …m-marble one below 24-across (Lisa)? (6)
Thanks to the theme, one below Lisa = Maggie. No explanation for the rest of it, though.
23 across: Wires hack lads without notice, holding back carer of… (Lisa) (10)
Carer of Lisa = Marge and back carer of lisa = egram giving a significant portion of cablegrams = wires, but the cabls I can’t explain.
4 down: Remove 18-down (Simpsons), frequently (4, 6)
Remove = take off, but I can’t see how that has anything to do with Simpsons, frequently.