South African grassland (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">south african grassland</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 veldt that I've seen before include "S. Afr. open grassland" , "Open grassland in South Africa" , "Southern African prairie" , "SA grassland" , "Southern African grassland" .)