Fictional sleuth Wolfe (4)
I believe the answer is:
nero
'fictional sleuth wolfe' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nero that I've seen before include "Emperor (who fiddled while Rome burned?) d. AD68" , "He's reputed to have fiddled while Rome burned" , "Wicked fiddler" , "Fiddling Roman emperor" , "Tyrannical Roman emperor" .)