Song of the proletariat? (4)

I believe the answer is:

aria

'song' is the definition.
(piece of music in an opera)

'of the proletariat?' is the wordplay.
'of' says the answer is hidden in the clue.
'ARIA' is hidden in the letters of 'proletariat'.

(Other definitions for aria that I've seen before include "Opera solo" , "Vocal solo in a cantata etc" , "Operatic part" , "Operatic tune" , "Song for solo voice from an oratorio, cantata etc" .)

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