Unit of work (3)

I believe the answer is:

erg

'unit of work' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for erg that I've seen before include "Unit of measurement of work" , "Energy expended" , "shifting sand" , "Unit of work or energy" , "Unit of work; dunes area" .)

I've seen this clue in the LA Times, The New York Times, the Penny Press, the Sydney Morning Herald, The Washington Post Sunday, The Guardian, The Wall Street Journal, The Irish Times and the King Feature Syndicate.

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