Crossword Genius

Heat measure (3)

Ross

I believe the answer is:

btu

'heat measure' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for btu that I've seen before include "British thermal unit (abbrev.)" , "Unit of energy related to Fahrenheit" .)

I've seen this clue in the Penny Press.
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