A villainous Charlie for nearly 2000 years? (3)
I believe the answer is:
cad
But I can't explain it at all! Could you help me understand?
(Other definitions for cad that I've seen before include "Dishonourable man of decadent sort" , "A knave, real rotter" , "he's no gent" , "Blackguard" , "Wretch" .)