Crossword Genius

Cake put away in France once cut (6)

Ross

I believe the answer is:

gateau

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'cake' is the definition.
(gateau is a kind of cake)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for gateau that I've seen before include "rich food" , "(French?) cake" , "Something French for 22?" , "Cake (from the Black Forest?)" , "Elaborate cake" .)

I've seen this clue in The Telegraph.
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