Possible Clues:

• Some basic ingredients in cakes?
• Preparation of vegetables, discarding head and topping
• Cake surrounder
• Formation of frost on aircraft
• Decoration on a 91-/100-Across
• Cake-making step
• One needing pipe, say — for this decoration?
• Topping passage of music in Gloriana
• Sweetest part of a cake, often
• Initially, it covered invitingly naughty gateau?