One stopping bribe (4)
I believe the answer is:
bung
This might be a double definition.
'one stopping' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'bribe' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for bung that I've seen before include "could be a corker" , "sweetener" , "illegal incentive" , "Large cork" , "Stopper, plug" .)