Endless church district in capital (5)
I believe the answer is:
paris
'capital' is the definition.
(capital of France)
'endless church district' is the wordplay.
'endless' means to remove the last letter.
'church district' becomes 'parish' (area associated with a church).
'parish' with its final letter taken off is 'PARIS'.
'in' acts as a link.
(Other definitions for paris that I've seen before include "English chronicler" , "I spar (anag)" , "Old prince" , "French department" , "City; Juliet's betrothed Count" .)