Frank is not finished with informer or chancer (8)
I believe the answer is:
operator
'frank is not finished with informer or chancer' is the definition.
I can't judge whether this definition defines the answer.
'frank is not finished with informer or' is the wordplay.
'frank' becomes 'open' ('open' can be a synonym of 'frank').
'is not finished' means to remove the last letter.
'with' is a charade indicator (letters next to each other).
'informer' becomes 'rat' ('rat' can be a synonym of 'informer').
'open' with its last letter removed is 'ope'.
'ope'+'rat'+'or'='OPERATOR'
Can you help me to learn more?
(Other definitions for operator that I've seen before include "Manipulative type of person" , "Poor rate (anag.)" , "Controller, of a machine say" , "Person who directs or controls, machine say (8)." , "User of machinery" .)