Blackmail material to strike down MP with: corruption involving mother (9)

'blackmail material' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'strike down mp with corruption involving mother' is the wordplay.
'strike down' becomes 'ko' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'with' is a charade indicator (letters next to each other).
'corruption' becomes 'rot' (rot can mean corruption or decay).
'involving' indicates putting letters inside.
'mother' becomes 'ma' (ma can mean mother).
'rot' placed around 'ma' is 'romat'.
'ko'+'mp'+'romat'='KOMPROMAT'

'to' is the link.

Can you help me to learn more?