Related Clues:

• One runt suffering — it's very small
• ___ thruster (NASA system)
• Bit produced by a smoke alarm
• Something small or very big turning up to impede soldiers
• Stable positively-charged elementary particle
• One working with a particle
• Elementary particle on tuner replaced
• Nothing in available charge
• An electrically charged particle
• Subatomic particle - in turn, one changing shape
• A very small thing - one won't be charged
• One turn diverted part of atom
• On tuner (anag.)
• Short-lived subatomic particle
• Particle, real or theoretical, of nucleus initially