Churchgoers not wholly in European city (5)

I believe the answer is:

paris

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'european city' is the definition.
(capital of France)

I cannot understand how the remainder of the clue works.

(Other definitions for paris that I've seen before include "Abductor of Helen" , "Helen's abductor" , "foreign city" , "City; Juliet's betrothed Count" , "An American in - -" .)

I've seen this clue in The Telegraph.

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