Crossword Genius

Spot a worker in the dark (4)

Ross

I believe the answer is:

mole

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'spot' is the definition.
(spot or blemish on the skin)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for mole that I've seen before include "Spy - creator of hills?" , "Burrowing mammal with velvety fur" , "Spot - burrowing mammal" , "Tunneller" , "Small burrowing animal" .)

I've seen this clue in The Globe and Mail.
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