Fool with Dickens over ... (4)
I believe the answer is:
bozo
'fool' is the definition.
(I've seen this before)
'with dickens over' is the wordplay.
'with' is a charade indicator (letters next to each other).
'dickens' becomes 'boz' (I've seen this in other clues).
'over' becomes 'o' (cricket abbreviation).
'boz' next to 'o' is 'BOZO'.
(Other definitions for bozo that I've seen before include "Stupid man (US)" , "Incompetent fool (US)" , "Dim fellow" , "American chap" , "Dimwit" .)