Unfinished draft of court document (4)
I believe the answer is:
writ
'court document' is the definition.
(I've seen this before)
'unfinished draft' is the wordplay.
'unfinished' means to remove the last letter.
'draft' becomes 'write' (I've seen this before).
'write' with its final letter removed is 'WRIT'.
'of' is the link.
(Other definitions for writ that I've seen before include "Veteran composed" , "Court instrument" , "Warrant, court order" , "Legal summons" , "court paper" .)