Related Clues:

• Arcane vocabulary
• Specialists' idiom
• Specialized jargon
• In-group lingo
• Some gangster-film dialogue, say
• Patois, vernacular
• Slang, patois
• Patois for groat
• Special language of a groat?
• Slang for a groat
• Father or mother
• Slang for groat
• Special jargon of a group
• Slang for a groat (5)
• Jargon or patois