Possible Clues:

• During Whitsun be a tennis-player not having suffered defeat
• Yet to be on the losing end, like the proverbially spoilt child?
• Not defeated, but food left is across middle of table
• It's still best for a French one to be an English 10
• Scrambled eggs will not be still on top
• With no defeats or like an egg still in the shell
• Not having suffered defeat
• Has always one, by the sound of it
• Always top, like the schoolboys of today?
• Left bishop inside, not out