Having gone the wrong way, be morally corrupt (4)
I believe the answer is:
evil
'morally corrupt' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for evil that I've seen before include "Maleficent" , "Wicked - vice" , "source of harm" , "Depraved" , "Live badly for badness" .)