Prearrange patient for feature of study? (8)
I believe the answer is:
bookcase
'feature of study?' is the definition.
(a study might contain a bookcase)
'prearrange patient' is the wordplay.
'prearrange' becomes 'book' (eg booking a table at a restaurant).
'patient' becomes 'case' (synonyms).
'book'+'case'='BOOKCASE'
'for' is the link.
(Other definitions for bookcase that I've seen before include "Article of furniture" , "It will be shelved" , "Reading matter cabinet" , "Library cabinet" , "Item of furniture" .)