Wash through (5)
I believe the answer is:
rinse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wash through</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 rinse that I've seen before include "Cleanse in water" , "Sluice" , "Colour" , "Wash lightly without soap" , "Wash - siren (anag)" .)