Being civil is very much like the police (6)

I believe the answer is:

polite

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'being civil' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for polite that I've seen before include "Not rude" , "Well-mannered, courteous" , "Good mannered and civil" , "Cultured, refined" , "Of courteous manners" .)

I've seen this clue in the Evening Standard.

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