Possible Clues:

• A grain's removed from the wine cocktail
• Spicy Spanish wine drink
• Belted out tune wrong way round after drink
• Purplish drink
• Wine and fruit drink
• Spanish drink of red wine with soda water or lemonade
• Was a chorister going to centre of restricted area for drink?
• Recalled atmosphere with chatter when imbibing new drink
• Having performed song, turned to drink
• Rendered a tune in return for a drink in Spain