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
• Orange juice, at times
• Band together for the entire year
• Not initially friendly colleague
• Unite by treaty or confederation
• Sociable mingler
• Socialiser's drink
• Everybody has yen for a friend
• The whole army is disarmed, chum!
• The whole of my half goes to a partner