Throw stopper (4)
I believe the answer is:
bung
I believe this is a double definition.
'throw' is the first definition.
(I've seen this before)
'stopper' is the second definition.
(bung is a kind of stopper)
(Other definitions for bung that I've seen before include "Stopper for closing hole in barrel" , "Bribe; throw" , "Plug for a hole in a small boat" , "Somehow stop" , "Bribe - bottle stopper" .)