A voice of phenomenal tone (4)

I believe the answer is:

alto

'a voice' is the definition.
(alto is a kind of voice)

'of phenomenal tone' is the wordplay.
'of' indicates a hidden word.
'ALTO' is hidden in the letters of 'phenomenal tone'.

(Other definitions for alto that I've seen before include "Singing range" , "someone to sing" , "High male singing voice" , "The highest adult male singing voice" , "Highest male voice: lowest female voice" .)

I've seen this clue in the Evening Standard.

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