Reserve container for library furniture (8)
I believe the answer is:
bookcase
'library furniture' is the definition.
(I've seen this before)
'reserve container' is the wordplay.
'reserve' becomes 'book' (to book something is to reserve it).
'container' becomes 'case' (case is a kind of container).
'book'+'case'='BOOKCASE'
'for' acts as a link.
(Other definitions for bookcase that I've seen before include "written works here" , "Item of furniture" , "Article of furniture" , "Library cabinet" , "Library furniture" .)