Friendly yet strange idea about getting to buy off a bully (6)
I believe the answer is:
allied
But I can't explain it at all! Could you help me understand?
(Other definitions for allied that I've seen before include "Joined for mutual benefit" , "Joined in friendship, treaty, etc" , "Joined together for mutual support" , "Joined to, combined with" , "(Of nations) working together" .)