Perpendicular, at sea (5)

I believe the answer is:

abeam

(Other definitions for abeam that I've seen before include "at right angles to vessel" , "At right angles to the side of a ship" , "across centre" , "neither fore nor aft?" , "In a line at right angles to a vessel's length" .)

I've seen this clue in the King Feature Syndicate.

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