Secret agent (3)

I believe the answer is:

spy

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

This is all the clue.

(Other definitions for spy that I've seen before include "Catch sight of" , "Glimpse" , "Notice" , "Spot" , "One gathers information surreptitiously" .)

I've seen this clue in the USA Today, The Telegraph, the Newsday, The Irish Times, the Universal, The New York Times, the LA Times, The Independent, the King Feature Syndicate, the Evening Standard, The Mirror and The Times.

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