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Gas connected to north-eastern French region (7)

Ross

I believe the answer is:

argonne

'french region' is the definition.
(Argonne is a region of France)

'gas connected to north-eastern' is the wordplay.
'gas' becomes 'argon' (argon is a gas).
'connected to' says to put letters next to each other.
'north' becomes 'N' (abbreviation).
'eastern' becomes 'e'.
'argon'+'n'+'e'='ARGONNE'

(Another definition for argonne that I've seen is " Forested area of First World War".)

I've seen this clue in The Telegraph.
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