In a manner, I'm wrong on certain points (4)

I believe the answer is:

mien

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

'in a manner' is the definition.
I can't tell whether this defines the answer.

'i'm wrong on certain points' is the wordplay.
'wrong' indicates an anagram.
'on' is a charade indicator (letters next to each other).
'certain points' becomes 'en' (two compass points. I am not sure about the 'certain' bit.).
'im' anagrammed gives 'mi'.
'mi'+'en'='MIEN'

Can you help me to learn more?

(Other definitions for mien that I've seen before include "Person's appearance or manner" , "Dignified manner" , "A face like mine" , "The carriage" , "Air - look - manner" .)

I've seen this clue in the Evening Standard.

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