Some music - true composition - brings delight (7)
I believe the answer is:
rapture
'delight' is the definition.
(I've seen this before)
'some music true composition' is the wordplay.
'some music' becomes 'rap' (musical genre).
'composition' indicates anagramming the letters (letters arranged or composed in a different order).
'true' with letters rearranged gives 'ture'.
'rap'+'ture'='RAPTURE'
'brings' acts as a link.
(Other definitions for rapture that I've seen before include "Sheer bliss or ecstasy" , "Feeling of bliss, elation" , "State of bliss and euphoria" , "Extreme delight" , "Transports of delight" .)