Responsible for a crime (6)
I believe the answer is:
guilty
'responsible for a crime' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for guilty that I've seen before include "Culpable" , "(Found) responsible for offence" , "Responsible for misdeed" , "Responsible for a crime" , "Blameworthy, at fault" .)