Crossword Genius

Diver's accessory (3)

Ross

I believe the answer is:

fin

(Other definitions for fin that I've seen before include "Fish propeller; end (Fr.)" , "Thin projection for fish to steer itself" , "A fish uses it to steer itself" , "For movement and balance in fish" , "Swimmer" .)

I've seen this clue in the Newsday.
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