Quick swim (3)
I believe the answer is:
dip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">quick swim</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for dip that I've seen before include "Quick swim" , "Informally a short bathe" , "Lower into water for short swim" , "Lower into liquid" , "baptism" .)