Slip out of large alcove (4)
I believe the answer is:
apse
This clue could be a double definition.
'slip' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'large alcove' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'out of' is the link.
Can you help me to learn more?
(Other definitions for apse that I've seen before include "Part of a church with the altar" , "inside church?" , "Church recess with domed or arched roof" , "may be seen in church!" , "part of cathedral" .)