Recumbent (6)
I believe the answer is:
supine
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">recumbent</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 supine that I've seen before include "looking up" , "Slow in acting" , "Prostrate" , "Flat on one's back" , "Use pin (anag.)" .)