Possible Clues:

• They're not exact
• Estimates, and what the last parts of 20-, 28- and 48-Across are, in different ways
• Estimates
• Numerical guesses
• Approximate estimates
• '___ include players, umpires and fans'
• Rough estimates ... or what the ends of 17-, 24-, 52- and 65-Across are?
• Exact opposites?