Insurance document (6)
I believe the answer is:
policy
'insurance document' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for policy that I've seen before include "Insurance contract" , "Set of principles - plan" , "Principle of action by an organization" , "Plan of action of organisation - honesty is the best one" , "Course of action proposed in a political manifesto" .)