Related Clues:

• Traffic signal
• Green ___
• Torch
• Word with show or artillery
• Not very taxing
• Fluffy, as cake
• Far from strenuous
• Airy
• It's often on at night
• Insubstantial
• End of a tunnel, proverbially
• See 10 Down
• Lamp
• PPCLI word
• Illuminate