Sheep dog (6)
I believe the answer is:
collie
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sheep dog</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that Collie is a type of sheep dog)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for collie that I've seen before include "Silky-coated sheepdog" , "Popular kind of sheepdog" , "Long-haired sheepdog" , "See 2" , "Working animal" .)