Crossword puzzle clue "black fuel for a furnace"

Here are the possible solutions for black fuel for a furnace clue

Answer
Clue
Relevancy
coal
Clue
Black fuel for a furnace
Furnace fuel
Old furnace fuel
Old-time furnace fuel
Furnace fuel, sometimes
Fuel in an old furnace
Fuel for an old furnace
Definition
to supply with a carbon fuel
fourstairheating
Clue
Limited furnace work that sounds like major furnace work?

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