Primarily, noses always sound, appropriately, like — this? (5)
I believe the answer is:
nasal
'this?' is the definition.
The definition suggests a singular noun which matches the answer.
'primarily noses always sound appropriately like' is the wordplay.
'primarily' says to take the initial letters.
The first letters of 'noses always sound appropriately like' is 'NASAL'.
(Other definitions for nasal that I've seen before include "Hooters" , "Sounding affected by cold" , "nozzle" , "of a prominent feature" , "Like some spray" .)