Hooting baby bird (5)
I believe the answer is:
owlet
'hooting baby bird' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for owlet that I've seen before include "Nestling" , "who'll give a hoot?" , "Baby bird of prey" , "Young nocturnal hunting bird" , "new hooter?" .)