Crossword Genius

Calm surrounds every other part of unitary authority (7)

Ross

I believe the answer is:

control

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'calm' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for control that I've seen before include "Keep in line" , "Mastery" , "Power to restrain or regulate" , "domination" , "Authority" .)

I've seen this clue in The Times.
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