Crossword Genius

On a train (6)

Ross

I believe the answer is:

aboard

'on a train' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for aboard that I've seen before include "on boat, perhaps" , "in a car" , "... [CRUISE SHIP] here, perhaps" , "on a yacht maybe" , "On vessel or vehicle" .)

I've seen this clue in the USA Today and the Universal.
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