Finished in court, in secret (6)
I believe the answer is:
covert
'secret' is the definition.
(similar in meaning)
'finished in court' is the wordplay.
'finished' becomes 'over' (over can mean finished or ended).
'in' means one lot of letters goes inside another.
'court' becomes 'ct' (abbreviation used in road names).
'over' going into 'ct' is 'COVERT'.
'in' acts as a link.
(Other definitions for covert that I've seen before include "Undercover; thicket" , "Hidden - thicket" , "A fox's retreat, secret" , "Not openly displayed" , "Area of undergrowth in which animals hide" .)