Jewish scholar’s talk, never-ending (5)
I believe the answer is:
rabbi
'jewish scholar's' is the definition.
(I've seen this before)
'talk never-ending' is the wordplay.
'talk' becomes 'rabbit' (rabbit can informally mean to talk).
'never ending' means to remove the last letter.
'rabbit' with its last letter taken off is 'RABBI'.
(Other definitions for rabbi that I've seen before include "Jewish law expounder" , "Jewish learned man" , "Hebrew teacher" , "A Jewish priest" , "Blue" .)