Flying start? (3)

I think it could be either:

Which length description are you looking for?:

aero

'flying start?' 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 "Prefix denoting air" , "Prefix meaning air or aircraft" , "bar" .)

I've seen this clue in the Universal, the LA Times, the King Feature Syndicate and the Penny Press.

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