A well-known name in hypnotism (4)

I believe the answer is:

otis

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'a well-known name' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'in hypnotism' is the wordplay.
'in' indicates the answer is hidden within the clue.
'OTIS' can be found hidden inside 'hypnotism'.

Can you help me to learn more?

(Other definitions for otis that I've seen before include "Lift man" , "Miss -- Regrets, Cole Porter song" , "-- Redding, US singer" , "---- Redding, 1941-67, soul singer" , "Cole Porter's miss who was "unable to lunch today"" .)

I've seen this clue in the Evening Standard.

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