Nelson ... (7)
I believe the answer is:
mandela
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nelson</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 mandela that I've seen before include "Nelson --, South African politician" , "Nelson lengthily detained" , "Nelson . . . . . . ., great African statesman (7)" , "Could be Nelson" , "Nelson --, South African statesman" .)