Top gangster got that woman to collect notes from minor triad (9)
I believe the answer is:
godfather
'top gangster' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'got that woman to collect notes from minor triad' is the wordplay.
'that woman' becomes 'her' (her refers to a woman).
'to collect' indicates putting letters inside (inserted letters are collected by others).
'notes from minor triad' becomes 'dfa' (I can't explain this - if you can you should give a lot more credence to this answer).
'got'+'her'='gother'
'gother' enclosing 'dfa' is 'GODFATHER'.
Can you help me to learn more?
(Other definitions for godfather that I've seen before include "gang boss" , "He sponsors a child at baptism" , "He's a sponsor at Baptism" , "Baptismal sponsor" , "Mafia chief or spiritual parent" .)