Crossword Genius

Listening device for solving a murder (7)

Ross

I believe the answer is:

eardrum

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'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" .)

I've seen this clue in the Irish Times.
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