Related Clues:

• 38-Across, to us
• It precedes 'Blastoff!'
• A person
• Noted Downing Street address
• Beauty mark?
• Word signaling the end of a match
• Sole
• Self starter?
• Microphone tester's word
• More than zero
• One after another?
• See 52-Down
• Coffee break time, perhaps
• Lowest VHF channel
• Jack's inferior