Possible Clues:

• Cajun French, e.g
• Word for 'beer' in dictionary, not standard English?
• Castilian vis-à-vis Spanish
• Laid-back court accepts English as a form of language
• Regional language variation
• Dictionary includes “beer” as local usage
• Unexpected detail about Conservative’s local speech
• Set up party eschewing leadership, in a manner of speaking
• Cockney vis-à-vis English
• Language as spoken in a particular place