Possible Clues:

• King in toga sent up criminal language
• Distinctive vocabulary
• Groat (anag)
• Unmarried woman's slang
• Some gangster-film dialogue, say
• Jargon, endless jargon by Tory leader
• Language coming from Thailand boat first
• Slang for old wool-ship on time
• Back the artist got with the jar gone, in a manner of speaking
• Idiomatic vocabulary