Related Clues:

• Work really hard
• Labour
• This will work if you lubricate the end of it
• Given some lubrication at last, this will work
• "Double, double ___ and trouble ..."
• Walk ungracefully
• "Bubble, bubble, ___ and trouble ..."
• Work up a sweat
• One among many getting up to work
• Labour's struggle
• Heavy going for pupil in school
• Tread slowly
• Walk like ploughman or policeman?
• Policeman - walk slowly
• Walk slowly and laboriously