Domed or vaulted recess (4)
I believe the answer is:
apse
'domed or vaulted recess' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for apse that I've seen before include "Rounded end of building" , "Primate holds saint to be a" , "Recess in church wall" , "space for altar" , "Recess with domed rof in a church" .)