Old buildings with nothing left but flies around (7)
I believe the answer is:
follies
'old buildings' is the definition.
The definition and answer can be both acts as well as being plural nouns.
Maybe you can see a link between them that I don't see?
'nothing left but flies around' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'left but' becomes 'l' (common abbreviation. I am not sure about the 'but' bit.).
'around' is an insertion indicator.
'o'+'l'='ol'
'ol' inserted inside 'flies' is 'FOLLIES'.
'with' is the link.
Can you help me to learn more?
(Other definitions for follies that I've seen before include "Idiocies" , "Ornamental buildings with no practical purpose" , "Silly acts or ornamental buildings" , "Rash actions" .)