Possible Clues:

• Painting skilfully, one might gush
• Boring source of energy?
• It brings joy when gushing
• One's drilled as result of time off work, effectively
• Hole in the Earth used to extract hydrocarbons
• Source of crude instruction to mechanic
• It's boring to make money
• Bore made for fuel
• Sunken source of fuel
• Boring thing