Bar in vacated interim structure (10)
I believe the answer is:
impediment
'bar' is the definition.
(thesaurus)
'vacated interim structure' is the wordplay.
'vacated' says to hollow out the word (remove centre letters) (internal letters vacate the word).
'structure' becomes 'pediment' (pediment is a kind of structure).
'interim' with its centre taken out is 'im'.
'im'+'pediment'='IMPEDIMENT'
'in' acts as a link.
(Other definitions for impediment that I've seen before include "Let" , "Obstacle" , "opposition" , "Hindrance, obstruction" .)