Crossword Genius

One who's always doing the wrong thing (6)

Ross

I believe the answer is:

sinner

I'm a little stuck... Click here to teach me more about this clue!

'one who's always doing' is the definition.
I can't tell whether this definition defines the answer.

'wrong thing' is the wordplay.
'wrong' becomes 'sin' (wrong can mean a sin or crime).
'thing' becomes 'ner' (I can't justify this - if you can you should give a lot more credence to this answer).
'sin'+'ner'='SINNER'

'the' acts as a link.

Can you help me to learn more?

(Other definitions for sinner that I've seen before include "One in breach of moral law" , "Immoral transgressor" , "Transgressor of the moral law" , "One who breaches the moral law" , "Offender against moral law" .)

I've seen this clue in the Evening Standard.
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