Related Clues:

• Gunfire sound
• See 39-Across
• Closer
• Impact sound
• Report
• Ending
• Collision sound
• When repeated, a shout when playing cowboy
• ''--- the Drum Slowly''
• Wind up
• [Suddenly!]
• Closing number
• Show stopper?
• When repeated, a kid cowboy's shout
• Wrap-up