Crossword Genius

Unit of work equal to one ten millionth of a joule (3)

Ross

I believe the answer is:

erg

(Other definitions for erg that I've seen before include "Shifting dunes in Sahara" , "Unit of work or energy" , "What's used to record work" , "shifting sand" , "Energy expended" .)

I've seen this clue in The Times.
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