Related Clues:

• With 60-Across, 1960's TV cartoon hero
• Gravity target
• Smashing subject
• Unit of a molecule
• Sunday service
• Religious ceremony
• Basic building block
• Wee thing
• What an inertial balance measures
• Tiny building block
• Infinitesimal bit
• Just a bit
• It's smashed in a lab
• Space occupier
• E=mcÓ component