Possible Clues:

• Supporting blocks inside
• 'I merely agreed to serve beer at some pubs, and now I'm ___!'
• Where publicans are locked up?
• Where, for example, cocktails are served in jail
• Where landlords serve captive
• Where one may see drinks dispensers in prison?
• Those serving drinks here canned?
• Where you might find the publicans or corrupt landlords that have been put away?
• Bum stops in prison
• Bribes had worked, protecting knight in prison