Church nooks (5)
I believe the answer is:
apses
'church nooks' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for apses that I've seen before include "Does 'e pass these in churches?" , "Domed areas in churches" , "Parts of church" , "Domed areas in church, usually where the altar is" , "Domed areas in church, usually where the altars are" .)