Possible Clues:

• Irritable teetotaller Raymond outside
• Angry tyrant arranged to banish knight
• Bad-tempered companion of Mr Toad
• Testy – Wind in the Willows character
• Irritable Democrat, typically somewhat diminished
• Irritable as overrun with vermin?
• Broken-down
• Irritable, peevish
• Irritable people who won't drink in sunlight
• In very bad condition