Moo (3)
I believe the answer is:
low
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">moo</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that moo can be written as low)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for low that I've seen before include "Inferior; moo" , "sound from Hereford?" , "Not high or loud" , "Moo; not high" , "Unimportant sort of owl" .)