Long to go about half a mile in a vehicle (6)

I believe the answer is:

sleigh

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'vehicle' is the definition.
(sleigh is a kind of vehicle)

I can't explain the remainder of the clue.

(Other definitions for sleigh that I've seen before include "Carriage to run on snow" , "Travel over snow" , "Horse-drawn sledge" , "vehicle drawn by reindeer" , "transport (with bells on!)" .)

I've seen this clue in the Evening Standard.

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