Large North American rodent (7)

I believe the answer is:

muskrat

(Other definitions for muskrat that I've seen before include "Beaver-like American rodent" , "Beaver-like rodent with glossy brown fur" , "Vole-like creature" , "Large aquatic rodent" , "North American water rodent - ark must (anag)" .)

I've seen this clue in The Sun.

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