Related Clues:

• Sailing spar
• Period of prosperity
• Sound of ... an explosion
• Dynamite sound
• A-B
• Crane component
• Up time
• Return to health
• Ka-blam!
• 'Ka-blam!'
• Sonic --
• Upsurge
• Upsurge in activity
• Sound made when passing the sound barrier
• Upturn