Electronics component (5)
I believe the answer is:
diode
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">electronics component</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for diode that I've seen before include "Valve" , "Electrical component" , "Electrical rectifier" , "Semiconductor device" .)