Possible Clues:

• Having the least weight
• With the least weight
• Least dark or least heavy
• The very bright one carries little weight
• Least heavy
• Betrayed sea captain leaving British trial most pale
• Thistle developed around Gulf is the least significant
• Seems thou providest illumination that carries very little weight
• Learner driver with the Stig could become most graceful
• Least significant part of grid badly set