Demonstrate strange clan is from somewhere in France (9)

I believe the answer is:

provencal

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'from somewhere in france' is the definition.
I can't judge whether this definition defines the answer.

'demonstrate strange clan' is the wordplay.
'demonstrate' becomes 'prove' (synonyms).
'strange' indicates an anagram.
'clan' with letters rearranged gives 'ncal'.
'prove'+'ncal'='PROVENCAL'

'is' acts as a link.

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(Other definitions for provencal that I've seen before include "dialect" , "French region" , "French language" , "of southern France" , "Language in France" .)

I've seen this clue in The Daily Express.

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