French cake (6)

I think it could be either:

Which length description are you looking for?:

gateau

'french cake' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for gateau that I've seen before include "Rich dessert cake" , "Elaborate cake" , "named for Black Forest?" , "Richly decorated cake" , "Black Forest dessert" .)

I've seen this clue in The Telegraph, The Irish Times and The Guardian.

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