Is both nosy and noisy (6)
I believe the answer is:
hooter
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for hooter that I've seen before include "It makes a loud noise" , "alarm" , "Siren, horn; nose" , "Siren, steam whistle" , "One scents" .)