Crossword Genius

About 624 gigaelectron-volts (3)

Ross

I believe the answer is:

erg

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

I've seen this clue in the Newsday.
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