Possible Clues:

• Provide incentive for singer sadly involved in drugs
• Fire is green, breaking out orange finally
• Give life for one man in Nouvion revolutionary is sheltering
• Add some ginger to greens, i.e. in a salad
• Motivate last pair of men before besieging foreign fighters
• Fire up
• Add zip to green pants in special exhibit initially
• Green salad is primarily eaten to invigorate
• Invigorate loco engineers with no end of passion
• Motivate English singer to perform Glyndebourne's finale