Metric weight unit (4)

I believe the answer is:

gram

'metric weight unit' is the definition.
(gram is a kind of metric weight unit)

This is the entire clue.

(Other definitions for gram that I've seen before include "Small unit of mass" , "Metric unit of mass" , "pulses" , "Metric unit of weight" , "Chickpeas; unit of mass" .)

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

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