Ill-feeling spread, attaching to most of monarch’s circle (7)
I believe the answer is:
rancour
But I can't explain it at all! Could you help me understand?
(Other definitions for rancour that I've seen before include "Bad feeling and resentment" , "Feeling of bitterness or dislike" , "Animosity" , "Bitterness and ill will" , "Malicious hostility" .)