Related Clues:

• It's composed of three quarks
• Money in 72-Across
• ___ over (swayed)
• Atomic constituent
• Positively-charged particle
• Particle with positive charge
• One is paid not to be backward one particle
• Was the first single sound
• Is there a particle of weight for the professional?
• The professional is positively not up to it - even a particle
• Is one paid to get over a particle of weight?
• Sounds as if one has come first
• Came first and came up for the present
• Is there a particle of weight to be attached to a professional?
• Troop to the North with little positive charge there