Related Clues:

• Participant in a collision
• "Damn, was ___ crack?" (Kanye West lyric)
• Label on the first of two file drawers, often
• Fermi's unit
• Cyclotron bit, perhaps
• Site of tiny orbits
• It may be smashed
• Nucleus + electrons
• Minute fragment
• Proton spot
• The genuine particle?
• Minuscule bit
• ___ thruster
• Wee energy source
• Certain smasher's target