Unfinished draft of court document (4)
I believe the answer is:
Here is my best explanation:
'court document' is the definition.
(I've seen this before)
'unfinished draft' is the subsidiary indication.
'unfinished' means to remove the last letter.
'draft' becomes 'write' (I've seen this before).
'write' with its last letter taken off is 'writ'.
'of' is the link.
(Other definitions for writ that I've seen before include "Summons to Parliament", "Legal or formal document", "Warrant, court order", "Court order document", "Legal document (usually issued)", "Court instrument", "Formal legal command", "Legal order in writing", "Legal summons" and "Legal document issued by an officer of the court".)