Crossword Genius

Furnace output (4)

Ross

I believe the answer is:

heat

'furnace output' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for heat that I've seen before include "Toast" , "Level of spice" , "Vehemence" , "Cook" , "Warmth - passion" .)

I've seen this clue in The Wall Street Journal, the Universal and the LA Times.
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