Deep-seated (5)
I believe the answer is:
inner
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">deep-seated</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 inner that I've seen before include "Very private room" , "Not quite bull's-eye" , "red" , "Located inside" , "Close to the centre; mental" .)