Something shiny in church, see (6)
I believe the answer is:
chrome
'something shiny' is the definition.
(chrome is a shiny material)
'church see' is the wordplay.
'church' becomes 'ch' (abbreviation on maps etc).
'see' becomes 'rome' (the Holy See or See of Rome is home to the pope).
'ch'+'rome'='CHROME'
'in' acts as a link.
(Other definitions for chrome that I've seen before include "Feature of bath taps" , "Silvery metal surface to prevent tarnishing" , "Deep yellow" , "Plate (for bathroom fixtures etc)" , "Hard stuff for plating - yellow pigment" .)