Vehicle going south to somewhere on sea, possibly (6)

I believe the answer is:

sleigh

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

I don't understand the remainder of the clue.

(Other definitions for sleigh that I've seen before include "transport (with bells on!)" , "Travel over snow" , "Reindeer-pulled sledge" , "Toboggan" , "Vehicle for transport over snow" .)

I've seen this clue in the Evening Standard.

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