Manuscript on good behaviour going about one's ways (10)

'ways' is the definition.
The answer and definition can be both human attributes as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'manuscript on good behaviour going about one's' is the wordplay.
'manuscript' becomes 'ms' (abbreviation for manuscript).
'on' says to put letters next to each other.
'good behaviour' becomes 'manners' (polite behaviour).
'going about' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'manners' enclosing 'i' is 'manneris'.
'ms' after 'manneris' is 'MANNERISMS'.

Can you help me to learn more?