Related Clues:

• Cooperating country
• Co-operating nation
• Recover after sacrificing queen to achieve mate
• Join (in treaty)
• Cooperating state
• Along came Polly on the margins offering support
• Band together for the entire year
• Not initially friendly colleague
• Friend or companion
• Unite by treaty or confederation
• Shed tears over working with a close friend
• Intimate companion
• Everybody has yen for a friend
• The whole army is disarmed, chum!
• Corny (anag.)