African plains grazers (4)
I believe the answer is:
gnus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">african plains grazers</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for gnus that I've seen before include "Animals" , "runners in Africa" , "Wildebeests" , "African runners" , "South African antelopes" .)