Crossword Genius

Running across a fish leaving river (5)

Ross

I believe the answer is:

abeam

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'running across' is the definition.
(nautical term)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for abeam that I've seen before include "At right angles to ship's length" , "at right angles to a ship's keel" , "across the deck" , "The way sailor goes across ship" , "at right angles to vessel" .)

I've seen this clue in The Times.
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