Chatter debased priest (5)
I believe the answer is:
rabbi
'priest' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for rabbi that I've seen before include "Spiritual leader of a Jewish congregation" , "Minister of a synagogue" , "Religious leader of Jewish congregation" , "Legal expert" , "Hebrew scholar" .)