Related Clues:

• They may play first
• Diamond workers
• Some ballplayers
• Diamond figures
• Who, What and I Don't Know, in Abbott and Costello's 'Who's on First?' routine
• Ones trying to prevent stealing
• Infielders
• Three of nine on a ballfield
• Old-style infielders
• Some infielders
• Fielders in a nine-a-side game