Related Clues:

• Referring to the tiny particle
• Immeasurably small
• Relating to minute matter (6)
• Referring to a tiny particle
• Referring to tiny particles
• Relating to tiny particles
• Bomb type
• Employing nuclear energy
• Might be 14 down, I see, with power
• It could be 8 across that has such a nuclear start, I see
• I see he is beastly, yet with great power
• What a powerful feling he is, I see
• The sort of energy a cat, I see, might have
• That's a powerful cat, I see
• I see he's a tiny bit catty, but very powerful