Crossword Genius

A table on the Orient Express? (6)

Ross

I believe the answer is:

aboard

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'the orient express?' is the definition.
Both the answer and definition are adverbs. Maybe there's a link between them I don't understand?

'a table on' is the wordplay.
'table' becomes 'board' (board is a kind of table).
'on' says to put letters next to each other.
'a'+'board'='ABOARD'

Can you help me to learn more?

(Other definitions for aboard that I've seen before include "On (a ship, train, etc)" , "on gig, perhaps?" , "Alongside" , "Part of the group" , "Embarked on (a ship)" .)

I've seen this clue in The Independent.
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