They produce sound body parts (6)
I believe the answer is:
organs
'body parts' is the definition.
(organ is a kind of body part)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for organs that I've seen before include "Periodicals published by special interest groups" , "Functional units in the body" , "Air-powered keyboard instruments" , "Keyboard instruments and body parts" , "Heart and lungs are vital ones" .)