The most common and most likely answer to this crossword clue is the 9 letter word SEMIBREVE
I've seen this crossword clue in Independent
S
E
M
I
B
R
E
V
E
More clues leading to the result SEMIBREVE
- Note from doctor, covering one priest in diocese
- Understand about part of speech I'm to write about in note
- Note a lot of commission on house
- Note book in suburban home always turns up
- Small music companyalways returns note
- Note of thirteenth letter in riddle cracked by Britain
- Note some housing minister in Bude on vacation
- Woman tempted by house with small bedroom makes note
- Note house on British river tempted woman
Buddy explains!

The straight part
We know that "Note" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case note = semibreve.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 SEMIBREVE mean?
SEMIBREVE noun- A musical note four beats long in 4/4 time; a whole note (US)