Possible Clues:

• Blackleg in Morecambe is unreliable
• Man goes about desert, wandering
• Irregular or uneven in movement or habit
• Unpredictable worker breaking strike in Morecambe?
• Unpredictable fellow as rodent-catcher
• Eccentric chap keeping a rodent
• Little by little he is about to be a pest, but not a regular one
• Irregular or uneven, not steady
• Irregular and unreliable
• Wayward Greek disheartened by sin