Walls to restrain chef’s bad language (6)

I believe the answer is:

french

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'language' is the definition.
(I know that Southern European languages is a type of language)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for french that I've seen before include "European language" , "From Paris possibly" , "eg Marie Antoinette" , "Word which may precede bean, chalk, cricket, horn" , "Continental language (Polish?)" .)

I've seen this clue in The Guardian.

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