Series of notes about guy who was official in Rome (7)
I believe the answer is:
tribune
'series of notes about guy who was official in rome' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'series of notes about guy' is the wordplay.
'series of notes' becomes 'tune' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' is an insertion indicator.
'guy' becomes 'rib' (both can mean to tease).
'tune' placed around 'rib' is 'TRIBUNE'.
Can you help me to learn more?
(Other definitions for tribune that I've seen before include "Roman people's official" , "Official upholder of the people's rights" , "basilica" , "Popular demagogue" , "Ancient Roman official, church dais" .)