Plant-eating sea mammal (7)

I believe the answer is:

manatee

(Other definitions for manatee that I've seen before include "Large aquatic mammal -- sea cow" , "'Amen, tea for the aquatic mammal (7)'" , "Sea denizen" , "sea creature appears" , "Sirenian mammal" .)

I've seen this clue in the King Feature Syndicate.

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