Possible Clues:

• Improvise showing ingenuity bottling blended gin
• Proceed without preparation
• Comic holding in good ad-lib
• Perform without any preparation
• Don't plan
• Improvise as supplier of a cross, exactly what's needed
• Improvise triumph against idiot
• Improvise, serving some chicken with vermouth
• Ad-lib in group, primarily during comedy
• Extemporize