7d) U.S. Purse, and what to do where thieves operate? (6,3) ????C? B?G
21d) Fancy candidates' DNA being extracted in mould! (3,4)
24d) King is able to upset another's natural talent (5) K???K
31a) It lives in thin layer of rock facing backwards (6)
All help greatly appreciated
Thank you all for your help. My apology for the typo regarding 31 across, where I wrote down the wrong clue. Correct clue is " Extremely refined exotic tale involving this place " 8 Letters ?T???E??