Related Clues:

• 38-Across, to us
• Specialty
• It precedes 'Blastoff!'
• The 'U' of CPU
• A person
• Troop group
• Hand or foot
• Sole
• Self starter?
• Course, in education lingo
• Part of I.C.U.
• Platoon or squadron, e.g.
• Microphone tester's word
• More than zero
• Complex division