Crossword Genius

Part of a joule (3)

Ross

I believe the answer is:

erg

'part of a joule' is the definition.
('erg' is part of 'joule')

This is the entire clue.

(Other definitions for erg that I've seen before include "Amount of work" , "Unit of work or energy" , "Shifting dunes in Sahara" , "Unit of measurement of work" , "Unit of work; dunes area" .)

I've seen this clue in The New York Times.
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