Possible Clues:

• Drink triple gin, initially, with one rum
• Drink, say, taken before invitation to dinner crops up
• Yuletide offering
• Gone around the gee-gee and drink its health
• Like medal picked up for alcoholic drink
• Holiday beverage
• Drink from a bowl
• Gone back over horse for Christmas drink
• Left back to stable horse — say Winter Warmer
• Quaff garnished with nutmeg