The most common and most likely answer to this crossword clue is the 11 letter word DECRESCENDO
I've seen this crossword clue in The Times
D
E
C
R
E
S
C
E
N
D
O
More clues leading to the result DECRESCENDO
Buddy explains!
The straight part
We know that "Poulenc's last score ended dramatically — thus?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case poulenc's last score ended dramatically — thus? = decrescendo.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 DECRESCENDO mean?
DECRESCENDO noun- An instruction to play gradually more softly.
- To gradually become quieter
- Becoming quieter gradually.