Possible Clues:

• The drink you shouldn't have had (... letters 3-4 and 7-9)
• Tippling point?
• More than is prudent
• What a hungover person might have had
• The straw that broke the camel's back gave the drinker a headache
• Drink that often makes a person sick
• Dylan "___ Mornings"
• The drink you shouldn't have had
• Drinker's excess