Wise guy's parting words briefly interrupted by doctor (7)
I believe the answer is:
solomon
'wise guy's' is the definition.
(I've seen this in another clue)
'parting words briefly interrupted by doctor' is the wordplay.
'parting words briefly' becomes 'solon' (I can't justify this - if you can you should give a lot more credence to this answer).
'interrupted by' indicates putting letters inside.
'doctor' becomes 'mo' (medical officer).
'solon' going around 'mo' is 'SOLOMON'.
Can you help me to learn more?
(Other definitions for solomon that I've seen before include "OT king" , "King known for wisdom" , "King of Egypt famous for wisdom and magnificence" , "Sage" , "Proverbially wise king" .)