Related Clues:

• Short series of chords in jazz
• Stevenson, lacking a book, improvised
• Make an impromptu speech
• Incomplete draft lawyer rejected at pleasure
• A Liberal Democrat out of order, not prepared for speech
• Unprepared to give a daughter party
• Irish backing to accompany very loud bit of music
• Short repeated phrase in music
• Speak unpreparedly
• Unexpected line from one playing sad librarian
• Guitar sequence
• Go off line?
• Make up one's lines
• Extract from 'triffic' piece of music
• Stage make-up