Domed recess (4)
I believe the answer is:
apse
'domed 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 "Strange peas in the church recess" , "Domed section of a church" , "may be seen in church!" , "Architectural feature in a church" , "room for an altar" .)