Crossword Genius

It moves with traffic, in brief (3)

Ross

I believe the answer is:

eta

(Other definitions for eta that I've seen before include "Greek letter - time due (abbr)" , "Militants" , "Something like 10 [RHO]" , "Greek letter - Basque nationalist movement" , "When one is due" .)

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