Sleekly designed, for short (4)

I believe the answer is:

aero

'sleekly designed for short' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for aero that I've seen before include "Prefix meaning air or aircraft" , "bar" , "Prefix denoting air" .)

I've seen this clue in the Newsday.com, The Wall Street Journal and the New York Times.

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