African ecosystem (9)
I believe the answer is:
serengeti
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">african ecosystem</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for serengeti that I've seen before include "Tanzanian wildlife area" , "Huge plain in Tanzania" , "African ecosystem" , "Vast plain" , "Tiger seen in Tanzania's great National Park" .)