American elk or Scottish rodent? (5)

I believe the answer is:

moose

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'american elk' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for moose that I've seen before include "US deer with enormous antlers" , "Large N American deer like European elk" , "North American elk" , "Ungulate" , "Animal" .)

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