A secluded walk (8)
I believe the answer is:
cloister
'a secluded walk' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
This is the entire clue.
Can you help me to learn more?
(Other definitions for cloister that I've seen before include "Cathedral area" , "Covered walk in religious institution" , "Covered walk along the side of a monastery" , "sacred enclosure?" , "Covered walkway round a cathedral courtyard" .)