Rectories I mixed up delivering desk (10)
I believe the answer is:
escritoire
'desk' is the definition.
(I know that escritoire is a type of desk)
'rectories i mixed up' is the wordplay.
'mixed up' is an anagram indicator.
'rectories'+'i'='rectoriesi'
'rectoriesi' anagrammed gives 'ESCRITOIRE'.
'delivering' is the link.
(Other definitions for escritoire that I've seen before include "Furniture item" , "Writing desk" , "Support for author" .)