Crossword Genius

Moving down river current on ship (6)

Ross

I believe the answer is:

aboard

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'on ship' is the definition.
(aboard a ship)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for aboard that I've seen before include "On (eg, a ship)" , "Joined for mutual benefit" , "On an aircraft" , "on base" , "A poet penning nothing on vessel" .)

I've seen this clue in The Guardian.
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