Rushing water (7)
I believe the answer is:
torrent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rushing water</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for torrent that I've seen before include "A rushing stream of water" , "fast-moving flow" , "Flood, spate" , "Rush of water" , "Stream in spate" .)