Reed (4)
I believe the answer is:
rush
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reed</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 rush that I've seen before include "Race" , "'Hurry, haste (4)'" , "Take by storm" , "Speed along - waterside plant" , "Sudden demand for product" .)