Top bishop's eschewing contemptible person (5)

I believe the answer is:

louse

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'contemptible person' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for louse that I've seen before include "Wingless bloodsucking insect" , "25 [PARASITE]" , "Wingless bloodsucker" , "Mean person" , "Contemptible type" .)

I've seen this clue in The Times.

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