Hee-haw (4)
I believe the answer is:
bray
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hee-haw</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bray that I've seen before include "Donkey's call; its vicar trimmed" , "Donkey's cry" , "Cry of animal" , "Donkey's heehaw" , "where musical vicar lived" .)