Cryptic clue- answer is a mode of transport

[cantsolveit]

Vineyard owner backs no horse, only losing heat. (8)
Ancient shard (3, 5)

Thanks

[bibblebub]

1 TOBOGGAN
vineyard owner = Naboth (biblical), back => htoban
no horse = O gg

put the former in the latter (don't see how that is suggested by the clue) and remove the h (heat)

tob OGG an

[woof57]

Old Crock ?