Thinks about beginning to ignore son's wrongs (7)

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

'thinks about beginning to ignore son's' is the wordplay.
'thinks' becomes 'muses' (musing is a kind of thinking).
'about' means one lot of letters goes inside another.
'beginning to' says to take the initial letters.
The first letters of 'ignore sons' is 'is'.
'muses' enclosing 'is' is 'MISUSES'.

Can you help me to learn more?