Related Clues:

• Speak without preparation
• Improvise one's lines
• Failing to start ribald dance without rehearsal
• Unscripted remark
• Not prepared to busk
• As much as you want
• It came from the performer's cuff
• Vamp has to make up
• Stray from the lines on the boards
• Publicity an old politician improvised
• Off the cuff remark from head librarian
• Freely available from head librarian
• Time note to sit up in passages where all take part
• Speak unprepared
• Notice politician extemporise