Elevated plain dish — to the French (7)

I believe the answer is:
plateau
'elevated plain' is the definition.
'plateau' can be an answer for 'plain' (I've seen this before). I am unsure of the 'elevated' bit.
'dish to the french' is the wordplay.
'dish' becomes 'plate' (plate is a kind of dish).
'to the french' becomes 'au' ('to the' in French).
'plate'+'au'='PLATEAU'
Can you help me to learn more?
(Other definitions for plateau that I've seen before include "Quiet time" , "Area of flat, high ground" , "plane" , "High flattish area" , "High plain" .)
