"King of Soul" Redding (4)
I believe the answer is:
otis
'king of soul redding' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for otis that I've seen before include "Cole Porter's miss who was "unable to lunch today"" , "Regretful miss" , "Miss -- Regrets, Cole Porter song" , "Lift man" , "- - Redding (soul music star)" .)