Dairy farm sounds
I believe the answer is:
moos
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dairy farm sounds</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 moos that I've seen before include "Sound of cattle" , "Cows' sounds" .)