Assistant held up by aristocratic junior doctor (13)
I believe the answer is:
paediatrician
'doctor' is the definition.
(I know that paediatrician is a type of medical specialist)
'assistant held up by aristocratic junior' is the wordplay.
I cannot quite understand how this works, but
'assistant' could be 'pa' (personal assistant) and 'pa' is found within the answer.
'by' could be 'at' and 'at' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for paediatrician that I've seen before include "Child doctor" , "Child's doctor" , "Specialist in children and their diseases" , "Specialist in treating children" .)