Crossword Genius

Gilbert and Sullivan comic opera first performed in 1875 (5,2,4)

Ross

I believe the answer is:

trial by jury

(Other definitions for trial by jury that I've seen before include "Twelve Angry Men?" , "SO - with 14a" , "Musical" , "that several must hear" , "G & S' "cornerstone of British legal system"" .)

I've seen this clue in The Mirror.
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