Related Clues:

• In a crush
• Specially formed, as a committee
• Wing it verbally
• Improvised, like a committee
• Wing it on stage
• Jury-rigged, perhaps
• Like some on-the-spot wireless networks
• Like some short-term committees
• Bit of stage creativity
• Improvised, in a way
• Disorient one's co-stars, in a way
• Wing it vocally
• Impromptu, as a committee
• Improvised musically
• Ignore the cue cards, say