Scholar to witter interminably (5)

I believe the answer is:

rabbi

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'scholar' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for rabbi that I've seen before include "A Jewish scholar or synagogue leader" , "Teacher of Jewish law" , "Minister of a synagogue" , "Sacks, for example" , "Jewish learned man" .)

I've seen this clue in The Sun.

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