Sigmund or Anna (5)
I believe the answer is:
freud
'sigmund or anna' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for freud that I've seen before include "Sigmund ...., great psychiatrist" , "See 9" , "Psychoanalysis pioneer" , "One introducing ID" , "See 17" .)