Everyman put in dictionary: 'pu's a Greek character' (7)

I believe the answer is:

oedipus

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But I can't explain it at all! Could you help me understand?

(Other definitions for oedipus that I've seen before include "Theban who married his mother" , "Mythical Greek who killed his father and married his mother" , "One who married his mother" , "Tragic king of Thebes (with a complex)" , "tragic hero" .)

I've seen this clue in The Everyman puzzle in The Observer.

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