River's edge (4)
I believe the answer is:
bank
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">river's edge</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 bank that I've seen before include "Financial institution - riverside" , "Count" , "Long mound; rely (on)" , "Reserve" , "River's edge" .)