Bunghole plug (6)
I believe the answer is:
spigot
This clue is a double definition.
'bunghole' is the first definition.
(thesaurus)
'plug' is the second definition.
(spigot is a kind of plug)
(Other definitions for spigot that I've seen before include "Beer tap" , "Plug - an American tap" , "Small plug for cask" , "Peg to seal vent in cask" , "Wooden tap on a cask" .)