Kept talking about the many who had betrayed one's trust (7,2)

'kept talking' is the definition.
(to rattle on is to talk incessantly)

'about the many who had betrayed one's trust' is the wordplay.
I cannot quite understand how this works, but
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'many' could be 'l' and 'l' is present in the answer.
'had' could be 'ate' ('have' can mean 'eat') and 'ate' is found in the remaining letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?