51-Across was obsessed with one (5)
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 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" .)