Singer Rush or Redding (4)

I believe the answer is:

otis

(Other definitions for otis that I've seen before include "---- Redding, 1941-67, soul singer" , "- - Redding (soul music star)" , "regretful lady" , "Regretful miss" , "Place of worship; side part of head" .)

I've seen this clue in the Universal.

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