Judicial document (4)
I believe the answer is:
writ
'judicial document' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for writ that I've seen before include "Warrant, court order" , "Formal command of law court requiring certain action" , "Formal legal command" , "Legal injunction" , "Legal document (usually issued)" .)