Crossword Genius

Unit of work in the lower grades (3)

Ross

I believe the answer is:

erg

'unit of work' is the definition.
(I've seen this in another clue)

'in the lower grades' is the wordplay.
'in' indicates a hidden word.
'ERG' can be found hidden inside 'lower grades'.

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

I've seen this clue in the Evening Standard.
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