Animosity displayed in sick legal document (7)
I believe the answer is:
illwill
'animosity displayed' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'sick legal document' is the wordplay.
'sick' becomes 'ill' (similar in meaning).
'legal document' becomes 'will' (a will is a type of legal document).
'ill'+'will'='ILLWILL'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for illwill that I've seen before include "bad blood" , "Hatred" .)