Anna, girl in a novel attachment with a dissolute rake (8)

'novel attachment with a dissolute rake' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'anna girl in a' is the wordplay.
I cannot really understand how this works, but
'girl' could be 'karen' and 'karen' is located in the answer.
'in' is present in the answer.
'a' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?