Crossword Genius

Bottom main beam of a ship (running fore-and-aft) (4)

Ross

I believe the answer is:

keel

(Other definitions for keel that I've seen before include "Long base of a ship" , "Low part of ship" , "ridge" , "Structure along base of ship" , "Flat-bottomed, coal carrying vessel" .)

I've seen this clue in The Guardian.
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