Owls' calls (5)
I believe the answer is:
hoots
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">owls' calls</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hoots that I've seen before include "Owls' noises" , "Jeers" , "Owl noises" , "Sounds of the owl" , "Loud raucous cries of an owl" .)