Paying back value of property mainly controlled by cartel (9)

'paying back' is the definition.
The definition and answer can be both to do with ownership as well as being present participle verbs.
Perhaps you can see a link between them that I can't see?

'value of property mainly controlled by cartel' is the wordplay.
'value of property' becomes 'equity' (I've seen this before).
'mainly' means to remove the last letter.
'controlled by' indicates putting letters inside (some letters restrict or block in others).
'cartel' becomes 'ring' (both can mean a criminal group).
'equity' with its final letter taken off is 'equit'.
'equit' put within 'ring' is 'REQUITING'.

Can you help me to learn more?