Imitate a donkey (4)
I believe the answer is:
bray
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">imitate a donkey</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 "Cry like a donkey" , "Neigh" , "Donkey call" , "Donkey's noise" , "The Vicar of --; heehaw" .)