Leak (4)
I believe the answer is:
drip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">leak</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for drip that I've seen before include "Sissy" , "Weak and pathetic person" , "Leak from tap" , "Liquid falling in small golbules, or a dull person" , "Intravenous administration of solution" .)