Cattle call? (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cattle call</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for moo that I've seen before include "unpopular woman" , "Bovine low" , "Cow's low" , "Cow's sound" , "Cow's call" .)