Person’s contribution (5)
I believe the answer is:
input
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">person's contribution</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 input that I've seen before include "Signal fed to equipment" , "supply" , "Comment, contribution" , "Data contributed" , "Signal supplied to a device" .)