### Clue: Investigation about fraudulent royal ends in Leeds? (6)
### Answer: CASTLE 
 ### Explanation: Definition: Leeds?
 CASE(an investigation, as in the many titles by Erle Stanley Gardner eg. "The Case of the Black-Eyed Blonde ") **containing**(about) **last letters, respectively, of**(… ends) "fraudulent royal".
Defn: An example of which/? is Leeds castle, nowhere near Leeds.