River bottom (3)
I believe the answer is:
bed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">river bottom</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 bed that I've seen before include "Couch" , "Divan" , "Place for plants and sleep" , "Sleeping place" , "Piece of furniture" .)