Wrongdoing found in records for bookies' income! (7)

'bookies' income' is the definition.
The answer and definition can be both related to property as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'wrongdoing found in records' is the wordplay.
'wrongdoing' becomes 'sin' (sin is a kind of wrongdoing).
'found in' indicates putting letters inside.
'records' becomes 'logs' (logging is a kind of recording).
'sin' put into 'logs' is 'LOSINGS'.

'for' is the link.

Can you help me to learn more?