Large African antelope with long straight horns (4)
I believe the answer is:
oryx
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large african antelope with long straight horns</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 oryx that I've seen before include "Large African antelope with long straight horns" , "African native" , "horny beast" , "Animal" , "Long-horned African antelope" .)