Religious group with Oedipus complex (4,3)
I believe the answer is:
opus dei
'religious group' is the definition.
(I've seen this before)
'oedipus complex' is the wordplay.
'complex' indicates an anagram.
'oedipus' anagrammed gives 'OPUS DEI'.
'with' acts as a link.
(Other definitions for opus dei that I've seen before include "A religious organisation" , "prayers" , "ritual worship" , "RC organization which maintains, among others, the University of Pamplona" , "Group of believers" .)