Situated inside (5)
I believe the answer is:
inner
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">situated inside</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 inner that I've seen before include "It's next to the bull on the board" , "just missing the gold" , "Annulus nearest bull" , "Close to the centre; mental" , "More secret, private" .)