Data entry (5)
I believe the answer is:
input
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">data entry</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 input that I've seen before include "Energy" , "Signal feeding a circuit" , "Data entry" , "Person's contribution (to a project)" , "Data etc supplied to computer" .)