Crossword Genius

A work unit (3)

Ross

I believe the answer is:

erg

This clue is a double definition.

'a work' is the first definition.
(an erg is a unit of work done)

'unit' is the second definition.
(erg is a kind of unit)

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

I've seen this clue in The Globe and Mail.
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