Possible Clues:

• 'Twelfth Night' sir
• Man in jug?
• Kind of jug
• Sir -- Belch, of 'Twelfth Night'
• Mug variety
• The dog would be a mug to get by to jug
• One gets to the dog by way of this with a punch
• Mr Punch's dog, beer-jug
• Bishop taken in by jest is a mug
• ''Twelfth Night'' character