Abridge legal document (8)
I believe the answer is:
contract
I believe this is a double definition.
'abridge' is the first definition.
('contract' can be a synonym of 'abridge')
'legal document' is the second definition.
(contract is a kind of legal document)
(Other definitions for contract that I've seen before include "Pick up" , "Agree - get smaller" , "four spades, perhaps" , "Agreement - lessen" , "type of bridge" .)