Twangy-voiced (5)
I believe the answer is:
nasal
I believe this clue is a double definition.
'twangy' is the first definition.
(I've seen this in another clue)
'voiced' is the second definition.
(thesaurus)
(Other definitions for nasal that I've seen before include "old face-saver" , "piece of armour" , "Relating to the nose" , "Describing some hooter" , "Like a twang" .)