Crossword Genius

Of all the noises known to man, it is the most expensive, per an old quip (5)

Ross

I believe the answer is:

opera

(Other definitions for opera that I've seen before include "Eg, The Magic Flute" , "Eg, Rigoletto" , "Musical stage work" , "some theatrics" , "Musical dramatic work" .)

I've seen this clue in The New York Times.
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