Be recumbent (3)
I believe the answer is:
lie
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be recumbent</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 lie that I've seen before include "Fib - be prone" , "Tell tales" , "Untruth; rest" , "Recline - untruth" , "Falsity" .)