Not suitable for use by quick talkers? (4,8)
I believe the answer is:
dead language
This might be a double definition.
'not suitable for' is the first definition.
The definition suggests a singular noun which matches the answer.
'use by quick talkers?' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for dead language that I've seen before include "Latin, for example" , "Grave accent a help, maybe" .)