Crossword Genius

51-Across was obsessed with one (5)

Ross

I believe the answer is:

whale

(Other definitions for whale that I've seen before include "Leviathan" , "Moby-Dick" , "Patch of oil, on water" , "World's largest mammal" , "Mammoth marine mammal" .)

I've seen this clue in The Wall Street Journal.
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