Possible Clues:

• Race between Scottish and Welsh
• 'Johnny --', 2003 film starring Rowan Atkinson
• Language that can be followed by setter, 20, in translation
• ... shingle found between Cornwall and Cumbria
• Tongue's no good in chutney that's dispensed with starter
• Widely-spoken language
• Language no good in priest's hole initially
• High school class
• Common language
• Language no good in priest’s hole, initially?