Fine Greek character left court (5)
I believe the answer is:
mulct
'fine' is the definition.
('mulct' can be a synonym of 'fine')
'greek character left court' is the wordplay.
'greek character' becomes 'mu' (letter from the Greek alphabet).
'left' becomes 'l' (common abbreviation).
'court' becomes 'ct'.
'mu'+'l'+'ct'='MULCT'
(Other definitions for mulct that I've seen before include "Diddle" , "Cheat; penalise" , "Extract money (from someone) by deceit" , "Fine - penalty" , "Fine - swindle" .)