A hooter (3)
I believe the answer is:
owl
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a hooter</span>' is the definition.<br/ ><span class="explanation-format__explanation">(owls hoot)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for owl that I've seen before include "Mainly nocturnal bird" , "Harry Potter's Hedwig, for instance" , "Wise figure" , "paragon of wisdom?" , "Fly low like a bird" .)