Crossword Genius

Police district or man, maybe (5)

Ross

I believe the answer is:

manor

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But I can't explain it at all! Could you help me understand?

(Other definitions for manor that I've seen before include "Landed estate" , "Big house - police district" , "Roman (anag.)" , "Lord's estate" , "patch" .)

I've seen this clue in the Evening Standard.
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