The most common and most likely answer to this crossword clue is the 5 letter word ETUDE
I've seen this crossword clue in Financial Times
E
T
U
D
E
More clues leading to the result ETUDE
- Music in sci-fi film due for redistribution
- Film buff wiping brow in study
- Best buddies regularly skipped study
- Treble’s final duet ruined piece
- Notes written to help Gertrude, stripped of German rights
- Musical study in France
- Who among the French avoids calm study?
- Duet conducted with Oriental composition
- Composition in film by Universal editor turned up
Buddy explains!

The straight part
We know that "Composition" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case composition = etude.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 ETUDE mean?
ETUDE noun- A short piece of music, designed to give a performer practice in a particular area or skill.