Tyrant who wronged one outright! (4)

I believe the answer is:

nero

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'tyrant' is the definition.
(Nero was a Roman tyrant)

I don't understand how the remainder of the clue works.

(Other definitions for nero that I've seen before include "Roman emperor who fiddled while Rome burned" , "Roman 9" , "He's reported to have fiddled while Rome burned" , "Roman Emperor, 54-68 AD" , "Roman Emperor notorious for vice and luxury" .)

I've seen this clue in the Evening Standard.

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