Church with sort of yellow room (7)
I believe the answer is:
chamber
'room' is the definition.
(I know that room can be written as chamber)
'church with sort of yellow' is the wordplay.
'church' becomes 'ch' (abbreviation on maps etc).
'with' says to put letters next to each other.
'sort of yellow' becomes 'amber'.
'ch'+'amber'='CHAMBER'
(Other definitions for chamber that I've seen before include "boudoir?" , "Judicial assembly - room" , "Compartment" , "Enclosed cavity, part of gun" , "in which to get the bullet?" .)