Result: fine is doubled in East European court (6)
I believe the answer is:
effect
'result' is the definition.
(synonyms)
'fine is doubled in east european court' is the wordplay.
'fine' becomes 'f' (abbreviation).
'is doubled' shows that letters should be duplicated.
'in' means one lot of letters goes inside another.
'east european' becomes 'ee' (this could be a standard abbreviation which I don't know about).
'court' becomes 'ct' (abbreviation used in road names).
'f' doubled is 'ff'.
'ff' put within 'ee' is 'effe'.
'effe'+'ct'='EFFECT'
Can you help me to learn more?
(Other definitions for effect that I've seen before include "'Result, consequence (6)'" , "Change produced by impact or other cause" , "Consequence, outcome" , "Meaning < to force" , "Consequential change; state of becoming operative" .)