Possible Clues:

• Resentment over a prior wrong
• Ax to grind with Barnaby's brother George?
• Resentful feeling after long walk, briefly good for time at start
• A strong resentment
• Something that maybe you shouldn't hold
• Envy (a person something)
• Active grievance
• Resentment looking back, for example, over drug boss
• Active resentment
• Resent Gloucester unleaded garage being all empty