Related Clues:

• Kind of cat?
• Cool, to a cat
• Clued in, once
• "Are You --- to the Jive?"
• Kind of pocket or socket
• Onto the jive
• "Cool" relative
• "With it"
• Like jazzmen
• Zoot-suited, say
• Down with what the kids are into these days
• Cool, in the '40s
• Viral inflammation, informally
• Cool, in the '50s
• Hardly old-fashioned, in an old-fashioned way