Related Clues:

• 38-Across, to us
• It precedes 'Blastoff!'
• Water growth
• A person
• Troop group
• Sole
• Self starter?
• Tiny organism
• Microphone tester's word
• More than zero
• Press ___
• Bit of plankton
• The Marines, e.g.
• See 32-Across
• Count start