Hypnotic voice, overwhelming bass (9)

I believe the answer is:

barbitone

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'hypnotic voice overwhelming bass' is the definition.
I can't judge whether this defines the answer.

'voice overwhelming bass' is the wordplay.
'voice' becomes 'baritone' (baritone voice is a kind of voice).
'overwhelming' indicates putting letters inside.
'bass' becomes 'b' (musical abbreviation).
'baritone' enclosing 'b' is 'BARBITONE'.

Can you help me to learn more?

(Other definitions for barbitone that I've seen before include "sedative" , "Sleeping aid" , "Drug" .)

I've seen this clue in The Independent.

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