Place within (5)
I believe the answer is:
inset
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">place within</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for inset that I've seen before include "Piece introduced" , "Small picture placed within a larger one" , "Part of magazine" , "subsidiary diagram" , "one image within another" .)