Crossword Genius

Traffic unit? (4)

Ross

I believe the answer is:

kilo

'traffic unit?' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for kilo that I've seen before include "2.2 lbs" , "Metrical unit of weight" , "Approx 2 point 205 lbs" , "Metric weight (abbrev.)" , "possible drugs unit" .)

I've seen this clue in the Universal and the Wall Street Journal.
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