Crossword Genius

Energy measure (3)

Ross

I believe the answer is:

erg

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

This is the entire clue.

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

I've seen this clue in The Sun, the Newsday.com, the Newsday and the King Feature Syndicate.
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