"Qu'ils mangent de la ____” (Rousseau) (7)

I believe the answer is:

brioche

(Other definitions for brioche that I've seen before include "French bread roll" , "Bread roll of Normandy" , "Soft roll made of light yeast dough" , "Sponge cake or roll" , "Type of light soft roll" .)

I've seen this clue in The Times.

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