All inside have shelter (7)
I believe the answer is:
content
'all inside have shelter' is the 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?
'have shelter' is the wordplay.
'have' becomes 'con' (I can't explain this - if you can you should believe this answer much more).
'shelter' becomes 'tent' (a tent is a kind of shelter).
'con'+'tent'='CONTENT'
Can you help me to learn more?
(Other definitions for content that I've seen before include "Satisfied - subject matter" , "Elements" , "Gratify" , "Satisfied - all within - capacity" , "Gist" .)