Old horse returns, in the end, to marshland pulling sled (8)

I believe the answer is:

toboggan

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'sled' is the definition.
(I know that toboggan is a more specific form of the action sled)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for toboggan that I've seen before include "Narrow sled for snow" , "Narrow sledge" , "Long narrow sled" , "Sliding vehicle" , "Slider" .)

I've seen this clue in The Irish Times.

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