Water ___, mammal dubbed the "cheetah of the wetlands" for its speed and stealth (5)

I believe the answer is:

shrew

(Other definitions for shrew that I've seen before include "Insectivorous mammal" , "Little mammal; a scold" , "Tamable woman?" , "Mouse-like animal or scolding woman" , "Woman who's assertive" .)

I've seen this clue in The New York Times.

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