Listening device for solving a murder (7)
I believe the answer is:
eardrum
'listening device' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'solving a murder' is the wordplay.
'solving' indicates an anagram (anagrams are puzzles).
'a'+'murder'='amurder'
'amurder' with letters rearranged gives 'EARDRUM'.
'for' is the link.
Can you help me to learn more?
(Other definitions for eardrum that I've seen before include "Hearing membrane" , "Listener partly" , "Aural membrane" , "It vibrates to sound" , "Ear membrane" .)