One millionth of a metre (6)

I believe the answer is:

micron

'one millionth of a metre' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for micron that I've seen before include "Micrometre" , "One millionth of 1 metre" , "hardly any length" , "Small length" , "One-millionth of a metre" .)

I've seen this clue in the Sydney Morning Herald.

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