Move in water (4)
I believe the answer is:
swim
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">move in water</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 swim that I've seen before include "Be immersed" , "Go for a dip" , "Sink or ____" , "Bathe" , "Move through the water - be dizzy" .)