Video camera button (3)
I believe the answer is:
rec
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">video camera button</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for rec that I've seen before include "Recreation ground (informal)" , "play area" , "record" , "Sporting venue" , "place for outdoor games" .)