Legal attachment (4)
I believe the answer is:
lien
'legal attachment' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lien that I've seen before include "Right to another's property, if an obligation is not discharged" , "Legal right to detain property" , "Security for a debt" , "Sequestration order" , "Legal claim on the property of another" .)