Related Clues:

• Aware of what's ''in''
• Far from square
• Wise to the jive
• Drill sergeant's intro
• Coolly aware
• In, back in the day
• Kind of cat?
• Mod
• Cool, to a cat
• Clued in, once
• "Are You --- to the Jive?"
• "With it"
• Like jazzmen
• Zoot-suited, say
• Cool, in the '40s