Singer in musical, Tommy (4)

I believe the answer is:

alto

'singer' is the definition.
(type of singing voice)

'in musical tommy' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ALTO' is hidden in the letters of 'musical tommy'.

(Other definitions for alto that I've seen before include "Counter-tenor or contralto" , "someone to sing" , "One who sings" , "Woman's singing voice" , "Singer's hidden inside chemical toilet" .)

I've seen this clue in The Telegraph.

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