Ship that goes by land (7)
I believe the answer is:
coaster
'ship' is the definition.
(coaster is a type of ship)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for coaster that I've seen before include "Small mat for glass" , "Mat to protect a table" , "Small table mat" , "Mat for decanter or glasses" , "Trading vessel" .)