Crossword Genius

A number given to someone to sing (4)

Ross

I believe the answer is:

alto

'someone to sing' is the definition.
(I've seen this before)

'a number given to' is the wordplay.
'number' becomes 'l' (L is an example).
'given' is a charade indicator (letters next to each other).
'a'+'l'+'to'='ALTO'

(Other definitions for alto that I've seen before include "The highest adult male singing voice" , "Singer's hidden inside chemical toilet" , "Low female singing voice" , "Woman's singing voice" , "Kind of singing voice, male or female" .)

I've seen this clue in The Globe and Mail.
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