"Queen of Crime" Christie (6)
I believe the answer is:
agatha
'queen of crime christie' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for agatha that I've seen before include "-- Christie, English novelist" , "female" , "Writer who created Hercule Poirot, . . . . . . Christie" , "...... Christie wrote great detective stories" , "- Christie, detective novelist" .)