Coffee business included in register of names (7)
I believe the answer is:
robusta
'coffee' is the definition.
(type of coffee bean)
'in register of names' is the wordplay.
'in' is an insertion indicator.
'register' becomes 'rota' (I've seen this in other clues).
'of names' becomes 'bus' (I can't justify this - if you can you should give a lot more credence to this answer).
'rota' going around 'bus' is 'ROBUSTA'.
'business included' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for robusta that I've seen before include "One kind of coffee" , "Here's coffee" .)