The most common and most likely answer to this crossword clue is the 8 letter word CAVATINA
I've seen this crossword clue in Independent
C
A
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More clues leading to the result CAVATINA
Buddy explains!
The straight part
We know that "Song" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case song = cavatina.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 CAVATINA mean?
CAVATINA noun- An operatic song in slow tempo, either complete in itself or (e.g., in Bellini and Verdi) followed by a faster, more resolute section: hence
- A rather slow, song-like instrumental movement; the title, for example, of a movement in Beethoven's string quartet in B flat, op. 130 (1826) and of a once-famous piece (originally for violin and piano) by Raff, and of the slow movement of Rubra's string quartet No. 2.