Possible Clues:

• Resentful longing wherever green is worn perhaps
• ''King of Rock and Roll''
• Begrudge diplomat dropping round
• Be jealous of diplomat dropping round
• Sin for the green-eyed
• 'As rust corrupts iron, so ___ corrupts man': Antisthenes
• Does the wearing of the green make one so covetous as this?
• Sin of ambassador with nothing to lose?
• Resentment of another's success
• The resentment of an emissary without love