Vault lined proper dump (7)
I believe the answer is:
fleapit
'vault lined proper dump' 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?
'vault lined proper' is the wordplay.
I cannot quite see how this works, but
'vault' could be 'leap' (I've seen this before) and 'leap' is found in the answer.
'proper' could be 'fit' (I've seen this in another clue) and 'fit' is found in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for fleapit that I've seen before include "Shabby place" , "Run-down cinema" , "shabby public building" , "Shabby old cinema" , "Scruffy cinema" .)