Al with bad scar is villain (6)
I believe the answer is:
rascal
'is villain' is the definition.
(I've seen this before)
'al with bad scar' is the wordplay.
'with' says to put letters next to each other.
'bad' is an anagram indicator.
'scar' with letters rearranged gives 'rasc'.
'al' put after 'rasc' is 'RASCAL'.
(Other definitions for rascal that I've seen before include "Pickle" , "Michievous person/child" , "Mischievous fellow" , "Cad" , "Horror" .)