NY prosecutor upset with Mafioso's additional charge (3-2)
I believe the answer is:
add-on
'charge' is the definition.
(I have seen 'Extra charge' mean 'add on' so perhaps 'charge' could also mean 'add on')
'ny prosecutor upset with mafioso's additional' is the wordplay.
I cannot really understand how this works, but
'mafioso' could be 'don' and 'don' is found within the answer.
The remaining letters 'ad' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for add-on that I've seen before include "Accessory device" , "Computer optional extra" , "Optional item as supplement or increment" , "Extra bit" , "Extra peripheral item" .)