River branch (4)
I believe the answer is:
fork
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">river branch</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 fork that I've seen before include "Eating iron" , "Double attack on board" , "Branch, prong" , "Road division" , "Split into two parts" .)