Crossword Genius

Traitor – informant (3)

Ross

I believe the answer is:

rat

I believe this clue is a double definition.

'traitor' is the first definition.
(rat can mean a treacherous person)

'informant' is the second definition.
(rat is a kind of informant)

(Other definitions for rat that I've seen before include "Unpleasant character" , "Sewer rodent" , "Unpopular rodent" , "one escaping doomed vessel?" , "Despicable person" .)

I've seen this clue in The Guardian.
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