Related Clues:

• Like jazz musicians
• Like cool cats
• With it, '40s-style
• Cool, in old slang
• Cool, to jazzmen
• Not squaresville
• Like jazz musicians
• Word in a cadence
• Like a jazz cat
• Plugged in
• Savvy about (with ''to'')
• Cool, to a bebopper
• "Cool," once
• With it, at one time
• Aware of what's ''in''