The most common and most likely answer to this crossword clue is the 5 letter word MUSIC
I've seen this crossword clue in Independent
M
U
S
I
C
More clues leading to the result MUSIC
- Country, say, America, then India, toured by host
- Greek character thus gets score?
- Perhaps rock foreign character so
- Notes produced by Greek character thus
- I total up, roughly, the score?
- See 15 Down
- Cubism without Braque’s beginning to morph into different art form
- Perhaps house or garage?
- Equipment for performer absorbing us in this?
- Score as recorded, following header from Man United
Buddy explains!

The straight part
We know that "see 15D" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case see 15d = music.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 MUSIC mean?
MUSIC noun- A series of sounds organized in time, employing melody, harmony, tempo etc. usually to convey a mood.
- Any pleasing or interesting sounds.
- An art form, created by organizing of pitch, rhythm, and sounds made using musical instruments and sometimes singing.
- A guide to playing or singing a particular tune; sheet music.
- Electronic signal jamming.
- Heated argument.
- Fun; amusement.
- To seduce or entice with music.