Crossword Genius

Spot a traitor (4)

Ross

I believe the answer is:

mole

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

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

'a traitor' is the second definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for mole that I've seen before include "Skin spot; breakwater" , "Small spot - small mammal" , "beauty spot" , "Spot - traitor" , "Dark spot on skin or burrowing animal" .)

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