Crossword Genius

Secret agent necessarily underground? (4)

Ross

I believe the answer is:

mole

I'm a little stuck...
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Here is my best explanation:

'secret agent' is the definition.
(mole is a kind of secret agent)

I don't understand the rest of the clue.

Ross

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This clue was last seen in The Telegraph

(Other definitions for mole that I've seen before include "Burrowing mammal with velvety fur", "Skin blemish and burrowing animal", "Amount of substance", "Small burrowing animal", "Small congenital skin spot", "Spy, skin spot and furry animal", "amount", "sauce", "A spy within an organisation" and "Animal - spy".)

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