The most common and most likely answer to this crossword clue is the 7 letter word DRUMMER
I've seen this crossword clue in Financial Times
D
R
U
M
M
E
R
More clues leading to the result DRUMMER
- Percussionist beginning to drink spirit by sea in Boulogne?
- Best in The Beatles, once?
- Moon was one day on right: no sun in season
- Collins, for one, is funnier after OED’s tip
- Musician’s introduction to dark stranger
- Musician‘s introduction to dark stranger
- Date with stranger musician
- REM comeback follows band’s finale with strange musician
- Moon was this close to asteroid, more suspect
- 22‘s doctor needing season to start late
Buddy explains!

The straight part
We know that "Musician" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case musician = drummer.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 DRUMMER mean?
DRUMMER noun- One who plays the drums.
- Travelling salesman
- A drumstick (the lower part of a chicken or turkey leg).
- Any of various fish of the family Kyphosidae which make a drumming sound.