The most common and most likely answer to this crossword clue is the 5 letter word CANTO
I've seen this crossword clue in The Daily Telegraph
C
A
N
T
O
More clues leading to the result CANTO
- Section of poem to preserve — Tasso’s no fool
- Part of Switzerland shortly offering a bt of poetry
- Roman censor suppresses new part of poem
- Worker in firm producing lyrical lines
- Something poetic from significant orator
- Piece of choral music in Anglican town
- Part of poem’s affected style of speech and poetic interjection
- Unable to love choral music
- Piece of poetry from somewhere in Switzerland, unfinished?
- Worker in firm produces piece of poetry
Buddy explains!

The straight part
We know that "piece of music" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case piece of music = canto.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CANTO mean?
CANTO noun- One of the chief divisions of a long poem; a book.
- The treble or leading melody.