Launch site (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">launch site</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 pad that I've seen before include "Writing block" , "Cushion" , "Sheets of paper fastened together along one edge" , "Protective guard; home" , "Fill with extra material in order to lengthen" .)