Crossword Genius

Clapping mammal (4)

Ross

I believe the answer is:

seal

(Other definitions for seal that I've seen before include "Imprinted disk affixed to a document" , "Member of an elite force within the US Navy" , "Sea mammal in sale" , "Make airtight" , "Wax stamp" .)

I've seen this clue in The Washington Post.
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