The most common and most likely answer to this crossword clue is the 6 letter word GATEAU
I've seen this crossword clue in Independent
G
A
T
E
A
U
More clues leading to the result GATEAU
- Short old French person eats tea cake
- Most of France no longer accepting drink or cake
- Opening a University? It’s more than a piece of cake
- Cake and a drink in heart of Burgundy
- Opener taking gold – that's rich!
- Good meal including a high-class cake
- Food in the afternoon in most of France once, say?
- Sweet drink invading nearly all of France once
- Some having a tea, usually, and cake
- Good university includes an afternoon meal, serving this?
Buddy explains!

The straight part
We know that "Cake" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cake = gateau.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does GATEAU mean?
GATEAU noun- A rich, usually iced, cake.
- A dish of minced meat made up like a pudding, and boiled in a shape or mould.