Black and white cattle breed (8)
I believe the answer is:
friesian
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">black and white 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 friesian that I've seen before include "Black and white dairy cattle" , "source of milk" , "Monochrome cow" , "Milk producer" , "Black and white cattle breed" .)