Parts of hearing as murder is dissected (8)
I believe the answer is:
eardrums
'parts of hearing' is the definition.
(body parts for hearing)
'as murder is dissected' is the wordplay.
'is dissected' indicates an anagram.
'as'+'murder'='asmurder'
'asmurder' is an anagram of 'EARDRUMS'.
(Other definitions for eardrums that I've seen before include "auditors" , "Hearing membranes" , "Membranes that vibrate when sound strikes them" .)