crackabilly:
6d yes to single t - gymnast has a single T , but athlete has 2 T's - quite a nice clue!
9d conSIDErable
24a THIN(G) thing - creature I suppose?
Hm. I could have sworn the post read "Please don't give me the answer - I'd just like to know if the letters I have are correct" but I guess I misread it.
Thank you all for your help Sorry for the delay in thanking you, but I've only just got up and read the posts. It was a stupid error on my part - just with the anagram; I'd got everything else.