Donkeys (5)
I believe the answer is:
asses
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">donkeys</span>' is the definition.<br/ ><span class="explanation-format__explanation">(an ass is a donkey)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for asses that I've seen before include "Pompous fools" , "Jennets" , "not the most sensible types" , "Animals of horse family" , "Fools; beasts of burden" .)