Musician remembered for (Sittin' On) The Dock of the Bay (4)

I believe the answer is:

otis

(Other definitions for otis that I've seen before include "---- Redding, 1941-67, soul singer" , "Cole Porter's miss who was "unable to lunch today"" , "- - Redding (soul music star)" , "US inventor" , "Regretful miss" .)

I've seen this clue in The Guardian.

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