Tease avant-garde composer for symmetrical part of his structure (7)
I believe the answer is:
ribcage
'symmetrical part of his structure' is the definition.
The definition suggests a singular noun which matches the answer.
'tease avant-garde composer' is the wordplay.
'tease' becomes 'rib' (rib can mean to tease or mock).
'avant-garde composer' becomes 'cage' (I've seen this before. I am not sure about the 'avant-garde' bit.).
'rib'+'cage'='RIBCAGE'
'for' is the link.
Can you help me to learn more?
(Other definitions for ribcage that I've seen before include "(Bones in) chest wall" , "part of chest" , "bone formation" , "bony frame" , "Bone structure of chest wall" .)