Assume a name (3)
I believe the answer is:
don
I believe this is a double definition.
'assume' is the first definition.
(thesaurus)
'a name' is the second definition.
(Other definitions for don that I've seen before include "A Spanish grandee like Quixote" , "Get into" , "Lecturer, Mafia chief and Spanish aristocrat" , "Put on; college teacher" , "Put on; lecturer" .)