"Double Trouble" blues guitarist Rush (4)

I believe the answer is:

otis

(Other definitions for otis that I've seen before include "Regretful miss" , "regretful lady" , "Company providing lifts" , "Miss -- Regrets, Cole Porter song" , "---- Redding, 1941-67, soul singer" .)

I've seen this clue in the USA Today.

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