Related Clues:

• A barrel, say, runs out when filling beer container
• Break the news briefly to Marsh knocking back wine glass
• Base holder, perhaps
• Lab container with a lip
• Shy long-suffering assistant of Dr Bunsen Honeydew in 'The Muppet Show'
• Drug-injecting worker in need of dough's a mug
• Vessel of ale containing a third of keg
• Muppet assistant of Dr. Bunsen Honeydew
• Good old boy allowed to see Grail?
• Cup (no handle)
• Drinking-vessel’s small mouth?
• Beaker allowed to touch mouth
• Tumbler’s kin
• Break the news briefly to Marsh knocking over wine glass
• Mug Rolls dealer touring Spain