With dad in tears, former partner makes business even bigger (2-7)

'business even bigger' is the definition.
I know nothing about this answer so I can't tell whether this works.

'with dad in tears former partner' is the wordplay.
'with' means one lot of letters goes inside another.
'dad' becomes 'pa' ('pa' can be a synonym of 'dad').
'in' means one lot of letters goes inside another.
'tears' becomes 'rends' (rending is a kind of tearing**).
'former partner' becomes 'ex'.
'rends' enclosing 'ex' is 'reexnds'.
'pa' inserted within 'reexnds' is 'RE-EXPANDS'.

'makes' is the link.

Can you help me to learn more?