Belgian? Flaw sees Belgium replaced by France (7)

I believe the answer is:

flemish

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'belgian?' is the definition.
(Flanders is part of Belgium)

I cannot understand how the remainder of the clue works.

(Other definitions for flemish that I've seen before include "tongue" , "Belgian language" , "Of Flanders, like its language" , "Second official language of Belgium" , "from the Low Countries" .)

I've seen this clue in The Guardian.

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