Doctor compared his fraternity with colleagues (11)
I believe the answer is:
comradeship
'doctor compared his fraternity with colleagues' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'doctor compared his' is the wordplay.
'doctor' indicates an anagram.
'compared'+'his'='comparedhis'
'comparedhis' anagrammed gives 'COMRADESHIP'.
Can you help me to learn more?
(Other definitions for comradeship that I've seen before include "friendliness" , "What's shared by close companions" , "Fellow-feeling" , "Camaraderie" .)