Screwed up Dickensian guy (7)
I believe the answer is:
twisted
'screwed up' is the definition.
(thesaurus)
'dickensian guy' is the wordplay.
'dickensian' becomes 'twist' (Charles Dickens character Oliver Twist).
'guy' becomes 'Ed' (short for Edward).
'twist'+'ed'='TWISTED'
(Other definitions for twisted that I've seen before include "Emotionally unbalanced" , "Danced" , "Tortuous - deformed" , "Bent, distorted" , "Warped, perverted" .)