Switch on (5,2)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">switch on</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 activate that I've seen before include "Cause to start, set in motion" , "Start working" , "Galvanize" , "Set off, trip" , "Turn on" .)