One end of the narthex (4)
I believe the answer is:
nave
'one end of the narthex' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nave that I've seen before include "Part of the church sounds like a rogue" , "Middle of wheel" , "Central area in a church" , "Part of a church sounds roguish" , "Central part of church" .)