Singer Clay in the Blues Hall of Fame (4)

I believe the answer is:

otis

(Other definitions for otis that I've seen before include "-- Redding, US singer" , "- - Redding (soul music star)" , "Regretful miss" , "Place of worship; side part of head" , "Miss -- Regrets, Cole Porter song" .)

I've seen this clue in the USA Today.

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