Crossword Genius

Heat black fossil fuel (4)

Ross

I believe the answer is:

boil

'heat' is the definition.
(thesaurus)

'black fossil fuel' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'fossil fuel' becomes 'oil' (I've seen this before).
'b'+'oil'='BOIL'

(Other definitions for boil that I've seen before include "let off steam" , "become inflamed" , "Eruption of the skin" , "7 in water" , "Cook in hot water" .)

I've seen this clue in The Guardian.
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