Throw large cork (4)
I believe the answer is:
bung
This clue is a double definition.
'throw' is the first definition.
(thesaurus)
'large cork' is the second definition.
(I've seen this before)
(Other definitions for bung that I've seen before include "Somehow stop" , "Plug for a hole in a barrel or boat" , "Rubber stopper" , "Throw; stopper" , "Cask stopper" .)