The most common and most likely answer to this crossword clue is the 10 plus 5 letter word ELECTRONIC MUSIC
E
L
E
C
T
R
O
N
I
C
M
U
S
I
C
More clues leading to the result ELECTRONIC MUSIC
Buddy explains!
The straight part
We know that "Stockhausen’s work" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stockhausen’s work = electronic 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.