Overwhelming flow (7)
I believe the answer is:
torrent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">overwhelming flow</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 torrent that I've seen before include "Raging flow" , "Violently fast stream of water" , "Overwhelming outpouring" , "Rapid stream" , "Heavy rain" .)