Possible Clues:

• Rap mogul, to friends
• Rap's Dr. ___
• "Dr." who raps
• Name hidden in 'mind reader'
• Rap's "Dr."
• Nickname that rhymes with "Clay"
• Anthony Anderson’s “Black-ish” role
• Junior's father on 'Black-ish'
• Nickname hidden in "gold record"
• Nickname that anagrams to 58-Across