Possible Clues:

• Fit to tackle shortage for power cut
• Want nothing but to bring round from fainting fit
• It sheds no light on shortage during session
• Faint lights not seen during this
• Power cut, scarcity during fight
• Electricity failure
• Period of darkness
• Need to have match around for when it's dark
• Extinguishing of lights (or consciousness)
• What's missing in a fight is obscure