Plug, stopper (4)
I believe the answer is:
bung
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">plug</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(bung is a kind of plug)</span><br/ ><br/ >'<span class="explanation-format__original">stopper</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(bung is a kind of stopper)</span><br/ ><br/ ></span>
(Other definitions for bung that I've seen before include "Bribe (slang)" , "Cask stopper" , "Plug for a hole in a barrel or boat" , "illegal incentive" , "Bribe; throw" .)