Where the cows come home (5)
I believe the answer is:
dairy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">where the cows come home</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 dairy that I've seen before include "milking cows here" , "Business supplying milk etc" , "Of foods) made from milk" , "milk supplier" , "Type of farm" .)