Travelling by a train or a ship? Mostly by road (6)
I believe the answer is:
aboard
'travelling by a train' is the definition.
I can't judge whether this defines the answer.
'a ship? mostly by road' is the wordplay.
'ship?' becomes 'boat' (I've seen this before).
'mostly' means to remove the last letter (most but not all of the word).
'by road' becomes 'rd' (abbreviation for road. I am not sure about the 'by' bit.).
'boat' with its final letter taken off is 'boa'.
'a'+'boa'+'rd'='ABOARD'
'or' is the link.
Can you help me to learn more?
(Other definitions for aboard that I've seen before include "Joined for mutual benefit" , "On (eg, a ship)" , "at sea, say?" , "on a yacht maybe" , "Part of the group" .)