Mammal digging holes, or a beauty spot (4)

I believe the answer is:

mole

(Other definitions for mole that I've seen before include "one in the Underworld?" , "Burrowing mammal with velvety fur" , "Breakwater; naevus" , "Skin blemish and burrowing animal" , "Adrian ---, fancies Pandora; lurking spy" .)

I've seen this clue in The Washington Post.

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