Hefty ocean animal (7)

I believe the answer is:

manatee

(Other definitions for manatee that I've seen before include "Sea cow - emanate (anag)" , "water animal" , "'Amen, tea for the aquatic mammal (7)'" , "Sea denizen" , "A neat me (anag) - large aquatic mammal" .)

I've seen this clue in the Universal.

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