Undercover agent

I think it could be either:

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'undercover agent' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for spy that I've seen before include "Undercover agent" , "Catch sight of" , "Notice" , "One gathers information on enemies" , "One who collects secret information as for government" .)

I've seen this clue in the Newsday, The Mirror, The New York Times, The Telegraph, The Star Tribune, the LA Times and the USA Today.

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