I've reformed the awful older baddie (8)

I believe the answer is:

evildoer

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'baddie' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?

'i've reformed the awful older' is the wordplay.
'reformed' indicates anagramming the letters.
'the awful' indicates an anagram.
'ive' anagrammed gives 'evi'.
'older' anagrammed gives 'ldoer'.
'evi'+'ldoer'='EVILDOER'

Can you help me to learn more?

(Other definitions for evildoer that I've seen before include "Malefactor" , "criminal!" , "sinner" , "'baddie'?" , "Rode live over morally bad person" .)

I've seen this clue in the Evening Standard.

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