Plumbing problem (4)
I believe the answer is:
drip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">plumbing problem</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for drip that I've seen before include "Splash - softie" , "Dribble" , "Fall in small drops as from wet clothes" , "Intravenous administration of solution" , "Fall in small drops as from tap" .)