Sleek, in car lingo (4)

I believe the answer is:

aero

'sleek in car lingo' 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 "bar" , "Prefix denoting air" , "Prefix meaning air or aircraft" .)

I've seen this clue in the King Feature Syndicate and the LA Times.

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