Most idiotic fools, right to the fore, in court (8)
I believe the answer is:
crassest
'most idiotic' is the definition.
(I've seen this before)
'fools right to the fore in court' is the wordplay.
'fools' becomes 'asses' (ass can mean a foolish person).
'right' becomes 'r' (common abbreviation).
'to the fore' says to put letters next to each other.
'in' means one lot of letters goes inside another.
'court' becomes 'ct' (abbreviation used in road names).
'asses' put after 'r' is 'rasses'.
'rasses' placed into 'ct' is 'CRASSEST'.
(Another definition for crassest that I've seen is " Most idiotic".)