Related Clues:

• Emergency CB channel
• Tree rings indication
• Lowest card in pinochle
• See 39-Across
• See 48-Across
• In the open
• Get on
• Mozart's age, when he wrote his Fifth Symphony
• Prime-time hour
• Umpire's call
• Midmorning
• Tennis call
• Slice of history
• Sensitive subject, to some
• See 115-Down