A fellow man (3)
I believe the answer is:
don
I believe this is a double definition.
'a fellow' is the first definition.
(both can mean an academic)
'man' is the second definition.
(Don is an example)
(Other definitions for don that I've seen before include "put on > one of several rivers" , "Put on the learned man" , "- - Giovanni, 26" , "Spanish gent or Mafia chief" , "Yorkshire river" .)