Related Clues:

• Reads between the lines?
• Script departures
• Wings it
• Improvises
• Wits' laugh-getters
• Riffs
• Unscripted stuff
• Lines that are not rehearsed
• Speaks extemporaneously
• Unscripted lines
• Puts in lines, maybe
• Talks without a 39-Down
• Extemporizes
• Does some improv
• Improvises lines