1000 kilograms (5)

I believe the answer is:

tonne

'1000 kilograms' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for tonne that I've seen before include "Metric weight unit" , "One thousand kilograms" , "Mass" , "1000 kilograms" , "1,000 kg" .)

I've seen this clue in the Evening Standard, the Sydney Morning Herald and The Wall Street Journal.

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