Relating to mankind (5)
I believe the answer is:
human
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">relating to mankind</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 human that I've seen before include "Anthropoid" , "Man, woman or child" , "Fallible - person" , "Being that's apt to err?" , "Of the species of homo sapiens" .)