Owl sounds (5)
I believe the answer is:
hoots
'owl sounds' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hoots that I've seen before include "Owls' cries" , "Owl calls" , "cries of derision" , "So hot (anag.)" , "Roars with laughter" .)