Crossword Genius

Millionth of a metre (6)

Ross

I believe the answer is:

micron

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">millionth of a metre</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for micron that I've seen before include "One-millionth of a metre" , "One millionth of 1 metre" , "One millionth of 3 Across" , "Micrometre" , "Small length" .)

I've seen this clue in The Guardian and The Times.
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