Took to court (4)
I believe the answer is:
sued
'took to court' is the definition.
('sue' can be a synonym of 'take to court')
This is all the clue.
(Other definitions for sued that I've seen before include "taken to court" , "Started legal proceedings against (someone)" , "Prosecuted" , "Brought an action against" , "Took legal action against" .)