Piece of music is heard to a greater extent (7)
I believe the answer is:
morceau
'piece of music' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for morceau that I've seen before include "Mime artist" , "piece of music" , "Fragment; short literary composition" , "Fragment, morsel (French); EC amour (anag.)" .)