Crossword Genius

Unlikely heroines in operas, typically (5)

Ross

I believe the answer is:

altos

(Other definitions for altos that I've seen before include "Singers" , "High male or low female voices" , "Females who sing in the lowest range" , "Lowest female singing voices" , "Highest male, lowest female, voices" .)

I've seen this clue in the LA Times.
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