Related Clues:

• Aimlessly tickled the ivories
• Unrehearsed comment
• Blocked, as radio signals
• Drift from a script
• Makeshift bar opening
• (Of group) formed for one purpose only
• The old man with good vessel's capsized -- substitute required
• Improvised in a band
• Serving as a temporary and less adequate substitute for something
• For one particular purpose, as a committee
• Kept the wolf from the door
• For a special purpose, as a committee
• Go off-message, maybe
• Surprise in a skit
• Like some short-lived committees