Heehaw (4)
I believe the answer is:
bray
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heehaw</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bray that I've seen before include "Sound asinine" , "time-serving vicar's parish" , "Donkey's call; its vicar trimmed" , "Donkey's heehaw" , "Ass's cry" .)