Possible Clues:

• Not broke - in a diplomatic sort of way
• Iran ends with diplomacy undamaged
• Not in bits, in politeness
• All there, when the tin explodes, to do something
• Not broken or damaged
• As a whole where diplomats excel
• It can't make a hole, by the sound of it
• Ulster backing diplomacy without a break
• Favoured having diplomacy undiminished
• How a C is not broke in there