Naturally nobody speaks this strangely neat prose (9)
I believe the answer is:
esperanto
'naturally nobody speaks this' is the definition.
The definition suggests a singular noun which matches the answer.
'strangely neat prose' is the wordplay.
'strangely' indicates anagramming the letters.
'neat'+'prose'='neatprose'
'neatprose' with letters rearranged gives 'ESPERANTO'.
Can you help me to learn more?
(Other definitions for esperanto that I've seen before include "No repeats of this artificial language, strangely" , "contrived speech" , "Ape tenors (anag.)" , "Artificial language invented for international use" , "Artificial speech-form" .)