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Stereo
apt
to
distort
musical
works
(9)
Stereo apt to distort musical works (9)
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The definition is at the end of the clue.
How the clue works
Right, so musical works at the end is your definition — pointing to those light operas. The rest, "Stereo apt", gets shaken about — "to distort" is your anagram signal — and rearranging those letters spells out OPERETTAS.