Marine using switch primarily for volume coming from hooter (5)
I believe the answer is:
nasal
'hooter' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Maybe you can see a link between them that I can't see?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for nasal that I've seen before include "Relating to the nose" , "front piece of helmet" , "like the sound from an organ" , "piece of armour" , "adenoids" .)