Related Clues:

• About to blow one's stack
• Filled with wrath
• Really ticked off
• Past peeved
• All bent out of shape
• Gershwin tune heartless and angry
• About to go off
• Wild creature that is captured
• Mad as hell
• Ready to 36-Across
• More than merely miffed
• Miffed and then some
• Super angry
• Super-angry
• Full of anger