Crossword Genius

Fish-like mammal (8)

Ross

I believe the answer is:

cetacean

(Other definitions for cetacean that I've seen before include "Generic name for whale, dolphin or porpoise" , "Large marine mammal" , "One swimming" , "Eg, whale, dolphin, etc" , "Member of the animal order containing whales and dolphins" .)

I've seen this clue in the Sydney Morning Herald.
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