Adler who outwitted Sherlock (5)

I believe the answer is:

irene

(Other definitions for irene that I've seen before include "Greek goddess of peace (English name)" , "Greek godess of peace" , "Goddess of peace - Byzantine ruler" , "woman" , "In Greek mythology, the goddess of peace" .)

I've seen this clue in the King Feature Syndicate and The Wall Street Journal.

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