Dairy cattle breed (8)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dairy cattle breed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for holstein that I've seen before include "Breed of black and white dairy cattle from northern Holland" , "dairy cow" , "German region" , "Source of beef" .)