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 Newsday, The New York Times, the King Feature Syndicate, The Telegraph, The Independent, The Mirror, the LA Times, the Evening Standard, The Irish Times, the USA Today, The Times and the Universal.

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