Related Clues:

• Castle protector, maybe
• Certain board member
• King protector, sometimes
• One on the front line
• One in line to be a queen?
• Patsy
• It can only go forward
• Least valuable chess piece
• Puppet
• One might be promoted
• King's frontman
• Recipient of a promotion
• Expendable chess piece
• Knight's neighbor
• One with a round head