Ugh! Not enjoying this one at all, even when I get the answers. It seems a bit clumsy.
I have a theme (though not the unclued things) and some themed answers but 19D doesn't appear to have a themed solution - someone said it was the least well-known but I can't find it at all, unless I've got the crossing letters wrong:
Drink spiked with poisons (8)
A-B-----
And sudokulover? I don't get your hint for 12A - I'd already tried what you suggested but didn't get anywhere. Any other hints for that one?
And my 4D is -I-G-G: surely not?
Top flirt (6)
Sorry, Paul, just don't like it. Shame, cos it's the first one in ages I could actually see.