Sign in to a computer (3,2)
I believe the answer is:
log on
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sign in to a computer</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 log on that I've seen before include "Prepare to surf, perhaps?" , "what the lumberjack's lorry may have?" , "Access the Internet" , "Gain computer access" , "Sign in to a computer" .)