Agatha Christie's detective (6)
I believe the answer is:
poirot
'agatha christie's detective' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for poirot that I've seen before include "... and her male one" , "10 [SLEUTH]" , "Hercule -, detective (Agatha Christie)" , "Hercule . . . . . ., Agatha Christie's detective" , "Agatha Christie's Belgian detective" .)