Sink unblocker (7)
I believe the answer is:
plunger
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sink unblocker</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 plunger that I've seen before include "Rubber device for clearing blocked pipes" , "Plumber's friend" , "Hand tool used to clean clogged drains" , "Device for unblocking drains" , "Better" .)