Raak's one has been bothering me for some time now. Some ideas I've had have been TURNED, TURBAN, TRUANT but none of them really seem right. I'm sure when the real answer comes up I'll feel really stupid for missing it. Some explanations of those ideas: I'd realised the "Twisted" misdirection quite early on. Presumably the letters of "nut", chopped (by which I assume anagrammed or split up or both), are in there somewhere, so it comes back to the small mammal. For TURBAN (and yes that's not a great answer for "Twisted") it would be "RAB" (heh) which could be a small form of RABBIT. Very messy, that one. TURNED it would be RED, which I covered above. TRUANT would be RAT, but is TRUANT an answer for "Twisted"? Still, Raak, if you'd be so kind, could you tell me if I'm anywhere near the right lines here?

Oh, and rab's "500" one was solved above, iirc.

Oh, and Chalky's is DARREN but uses a rather naughty indirect anagram.

[Darren] "Chopped" in this case means beheaded, rather than rearranged. The answer is a fairly uncommon word.

I believe Martha's Doctor was also solved, by CdM if I recall.

And the landmines one was also solved, by MF. And I could have sworn that some one had also posted the answer to Chalky's a while back, but maybe that was my imagination. I know I solved it and then didn't post the answer for some reason. So only the last three of Raak's list are outstanding.

I've got it: it's VOLUTE, and thanks for the hints.