Possible Clues:

• Top sporting association
• Union makes a nice change after all
• A couple of Liberals intended to depose leader in coalition
• Possibly bitter about one in clan breaking up marriage?
• Union of a couple of students making a nice change
• Bond in flirtatious relationship losing head
• Union giving everybody a nice woolly
• NATO, e.g
• Singleton losing out to everyone in daring partnership
• Flirtation, getting diamonds out, leads to marriage