Crossword Genius

Singer whose heart is in English opera (5)

Ross

I believe the answer is:

tenor

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'singer' is the definition.
(tenor is a kind of singer)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tenor that I've seen before include "Voice of Tamino" , "Carreras, for example" , "One singing" , "Eg, Luciano Pavarotti" , "Male singing voice of high pitch" .)

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