Related Clues:

• X
• See 48-Across
• Greek consonant
• See 16-Down
• Midwest city, on scoreboards
• Bears' home, briefly
• Greek antepenultimate
• See 41-Across
• Psi's preceder
• Windy City, for short
• X, as in Xenophon
• Life force, to an acupuncturist
• McBride of 'Boston Public'
• Greek X
• Corp. IDs