The most common and most likely answer to this crossword clue is the 7 letter word NIELSEN
I've seen this crossword clue in The Times
N
I
E
L
S
E
N
More clues leading to the result NIELSEN
- Composer set up a German school in London, note
- New cool shelters additionally for a Great Dane
- Composer Daniels ends in the middle
- News about one different composer
- Breaking news, one more Danish composer
- Name otherwise adopted by fashionable composer
- Composer adopts a respectful position, it’s said, with nurse
- Composer is otherwise in inn, drunk
- Comedy actor otherwise engaged by Walkabout Inn?
- TV rater and poet Anais assuming otherwise
Buddy explains!

The straight part
We know that "Composer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case composer = nielsen.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.