Highest part in a piece of choral music (5)

I believe the answer is:

canto

(Other definitions for canto that I've seen before include "part of long poem" , "Portion of poem" , "Highest part in a piece of choral music -- act on (anag)" , "Poetic piece" , "Division of e.g. Dante's Inferno" .)

I've seen this clue in The Guardian.

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