An owl's nose? (6)
I believe the answer is:
hooter
This clue is a double definition.
'an owl's' is the first definition.
(I've seen this in another clue)
'nose?' is the second definition.
(hooter can informally mean someone's nose)
(Other definitions for hooter that I've seen before include "owl?" , "alarm" , "Siren; nose (sl.)" , "Uphill stone pusher (Gk. myth)" , "Warning sound" .)