Nosey Nora asks such a lot of leaders (5)

I believe the answer is:
nasal
'nosey' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for nasal that I've seen before include "of central feature" , "regarding the nose" , "Letter such as M or N" , "Like a twang" , "Of sound, as if it came through the nose" .)
