Peace is here in city with no leaders (8)

I believe the answer is:

serenity

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'peace' is the definition.
('serenity' can be a synonym of 'peace')

I can't explain the rest of the clue.

(Other definitions for serenity that I've seen before include "Peace and quiet" , "Calm composure, peace" , "Tranquility, heartsease" , "Calmness" , "Peace, tranquillity" .)

I've seen this clue in The Telegraph.

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