Nontechnical name for a naevus (4)

I believe the answer is:

mole

(Other definitions for mole that I've seen before include "Naevus - burrowing mammal - spy" , "spy a > breakwater" , "Skin blemish and burrowing animal" , "Adrian ---, fancies Pandora; lurking spy" , "one in the Underworld?" .)

I've seen this clue in The Independent.

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