Singer in Balmoral tonight? (4)

I believe the answer is:

alto

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

'in balmoral tonight?' is the wordplay.
'in' indicates a hidden word.
'ALTO' is hidden in the letters of 'balmoral tonight'.

(Other definitions for alto that I've seen before include "Singing range" , "Unisex vocal range" , "The highest adult male singing-voice" , "Counter-tenor or contralto" , "Woman's singing voice" .)

I've seen this clue in the Sydney Morning Herald.

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