This is necessary for hearing a murder suspect (7)
I believe the answer is:
eardrum
'this is necessary for hearing' is the definition.
The definition suggests a singular noun which matches the answer. I also know that 'hearing' relates to this answer.
'a murder suspect' is the wordplay.
'suspect' indicates anagramming the letters (a suspicious or unusual spelling).
'a'+'murder'='amurder'
'amurder' anagrammed gives 'EARDRUM'.
Can you help me to learn more?
(Other definitions for eardrum that I've seen before include "Rude ram (anag.)" , "Otic membrane" , "hearing part" , "One hears" , "It vibrates to sound" .)