Possible Clues:

• Chancing to overlook top location for birthday message?
• Cause of a delay in a plane's takeoff
• Spotting, not missing, decorating job
• Freezing from anaesthetic in general?
• Sugary topping for cakes
• You could see this on a cake in the freezer?
• Initially it covered immensely nice gateau?
• Pastry decoration
• Classic ingenuity, boxing Victoria's decoration?
• Decorative coating on a cake