Crossword Genius

Bit of work

Ross

I believe the answer is:

erg

'bit of work' is the definition.
(unit of work in physics)

This is the entire clue.

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

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