Prefix with plane or space (4)

I believe the answer is:

aero

'prefix with plane or space' is the definition.
(I've seen this in another clue)

This is the entire clue.

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

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

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