Evicted criminal trapping Parisian and Maigret? (9)
I believe the answer is:
detective
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for detective that I've seen before include "such as Chesterton's father" , "Expert solver of clues" , "Sleuth" , "Public or private investigator" , "police officer" .)