Ready to drive (2,4)

I think it could be either:

Which length description are you looking for?:

2,4

in gear

'ready to drive' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for in gear that I've seen before include "Dressed up" , "Ready to drive off" , "Out of neutral?" , "Having shifted" , "Engaged" .)

I've seen this clue in the L.A. Times Daily, the Newsday.com, The Washington Post and the Newsday.

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