Crossword Genius

Teacher's pet, perhaps wasting time (5)

Ross

I believe the answer is:

rabbi

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rabbi that I've seen before include "Religious person" , "Hebrew scholar" , "Leader of worshippers" , "Religious leader in a Jewish community" , "Jewish minister" .)

I've seen this clue in The Telegraph.
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