Related Clues:

• Hard to see through
• Like a well-used chimney
• Flue-stricken?
• Like a smokestack
• Like Santa after a delivery
• Exhausted, to a southerner?
• Became overcast
• Pitch black
• Like 52-down
• Put over high heat
• Dark black
• Light blue Pac-Man pursuer
• Browned quickly
• Grew dim
• In need of a sweep