All being well it should be empty (8)
I believe the answer is:
hospital
'empty' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'all being well it' is the wordplay.
I cannot quite see how this works, but
'being' could be 'pi' (PI is an example) and 'pi' is present in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'should be' acts as a link.
Can you help me to learn more?
(Other definitions for hospital that I've seen before include "Sanatorium" , "Medical centre" , "Infirmary" , "Possibly Guy's" , "medical facility!" .)