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 "Legal document of command", "Summons to Parliament", "Document", "Sealed document", "Legal order in writing", "court paper", "Subpoena", "Legal document issued by an officer of the court", "It may be served" and "Legal or formal document".)