See what the bishop's flock is (7)

I believe the answer is:

diocese

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'see' is the definition.
(both can mean a bishop's associated area)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for diocese that I've seen before include "District under a bishop's authority" , "Bishop's region" , "Jurisdiction of a bishop" , "Church district" , "Bishopric" .)

I've seen this clue in The Irish Independent.

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