Offensive rumour about an upcoming doctor (7)
I believe the answer is:
noisome
'offensive' is the definition.
(I know that offensive can be written as noisome)
'rumour about an upcoming doctor' is the wordplay.
'rumour' becomes 'noise' (I've seen this in other clues).
'about' means one lot of letters goes inside another.
'an upcoming doctor' becomes 'om' (I can't justify this - if you can you should believe this answer much more).
'noise' going around 'om' is 'NOISOME'.
Can you help me to learn more?
(Other definitions for noisome that I've seen before include "Repugnant" , "Repellent" , "Stinking" , "Evil-smelling - sounds loud" , "Moonies (anag.)" .)