'Table' in France: a single dish with water (7)

I believe the answer is:

plateau

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'table in france' is the definition.
'plateau' can be an answer for 'table' (I've seen this before). I'm not sure about the 'in france' bit.

'a single dish with water' is the wordplay.
'a single dish with' becomes 'plat' (I can't justify this - if you can you should believe this answer much more).
'water' becomes 'eau' (I have seen 'French water ' mean 'eau' so perhaps 'water' could also mean 'eau').
'plat'+'eau'='PLATEAU'

Can you help me to learn more?

(Other definitions for plateau that I've seen before include "High flattish area" , "High flat land" , "Flat-topped upland" , "Flat raised land" , "tray that is ornamented" .)

I've seen this clue in The Everyman puzzle in The Observer.

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