Dreamy composition (8)
I believe the answer is:
nocturne
'dreamy composition' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nocturne that I've seen before include "Picture of a night scene" , "Dreamy musical piece" , "I take a dim view" , "Dreamy piano peace popularised by Chopin" , "Dark scene" .)