Dip in liquid (4)
I believe the answer is:
dunk
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dip in liquid</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 dunk that I've seen before include "Dip (eg, biscuit) in drink" , "Dip into tea, say" , "Put into a liquid" , "Submerge in liquid" , "Immerse (a biscuit)" .)