Sister accepting a judgement, finally, following lawsuit for compensation (12)
I believe the answer is:
satisfaction
'for compensation' is the definition.
(satisfaction is a kind of compensation)
'sister accepting a judgement finally following lawsuit' is the wordplay.
'sister' becomes 'sis' (synonyms).
'accepting' means one lot of letters goes inside another (inserted letters are accepted).
'a judgement finally' becomes 'at' (I can't justify this - if you can you should give a lot more credence to this answer).
'following' becomes 'f' (used when citing page numbers etc).
'lawsuit' becomes 'action' (synonyms).
'sis' placed around 'at' is 'satis'.
'satis'+'f'+'action'='SATISFACTION'
Can you help me to learn more?
(Other definitions for satisfaction that I've seen before include "I can't get no - (Rolling Stones)" , "Gratification" , "Pleasure" , "Contentment; reparation" , "Fulfilment; compensation" .)