Solo in an opera or oratorio (4)

I believe the answer is:

aria

(Other definitions for aria that I've seen before include "Song such as "Your Tiny Hand is Frozen"" , "Type of song" , "Song for solo voice from an oratorio, cantata etc" , "Operatic solo, duet, etc" , "selection of opera" .)

I've seen this clue in the Sydney Morning Herald.

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