Incestuous son Opus Dei corrupted inwardly (7)

I believe the answer is:

oedipus

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'incestuous son' is the definition.
The definition suggests a singular noun which matches the answer.

'opus dei corrupted inwardly' is the wordplay.
'opus dei' can be anagrammed to 'OEDIPUS'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for oedipus that I've seen before include "King of Thebes who married his mother" , "tragic hero" , "Old Greek king who killed his father and married his mother" , "Theban king of legend" , "Sort of complex" .)

I've seen this clue in The Independent.

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