Crossword Genius

Having gone the wrong way, be morally corrupt (4)

Ross

I believe the answer is:

evil

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'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" .)

I've seen this clue in The Sunday Times and The Times.
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