The most common and most likely answer to this crossword clue is the 7 letter word TOCCATA
I've seen this crossword clue in The Guardian
T
O
C
C
A
T
A
More clues leading to the result TOCCATA
- Feline in tattered coat gives touching display
- Music played staccato needing no introduction
- Piece that’s unusually staccato — not Schubert’s first
- Carbon copy perfectly covers a composition
- A need for diplomat to accommodate firm over work?
- With perfect exactness, carbon copies captured a collection of notes
- Piece of music has to carry a sound
- Cats love playing a bit of music
- Two acts composed, penning old baroque work
- Feline in mangy coat gives touching display
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 = toccata.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 TOCCATA mean?
TOCCATA noun- A piece of music (usually for a keyboard instrument) designed to emphasise the dexterity of the performer.